Cb750 coil test. We will check the coils by removing .

Cb750 coil test 6 ohm, which I believe is within the acceptable range of 3-5ohm? Tests fine from coil to plug cap when lines are attached. battery is still not charging, I have a voltage reg on its way, stater coil is testing fine, and even though the battery is not getting charged, since I installed the rotor the motor now cranks, starts, and runs better Have 78 CB750A with no spark. All we can do is test the stator, coil, and associated wiring, and if all that is ok, we can only assume the CDI box is at fault. Coming out of the coils, nothing. I am having problems with my 1975 Honda CB750 super sport. , l to. e. The Field coil s The Honda CB750 is an air-cooled, transverse, in-line-four-cylinder-engine motorcycle made by Honda over several generations for year models 1969–2008 with an upright, or standard, - The bike will charge if I bypass the regulator (plug the black wire into directly into the white going to the field coil). Just test the stator, and rectifier as described in the manual. A test for that The right coil does 2 &3, left outlet to 2 and right to 3. Misfire #2 CB750 1973 ** Solved - Petcock and Condenser related issues ** Thought maybe a bad coil, so I switched the wires going into the coil, one blue with one yellow and the two black/white wires. CB750 CB750 Member. 20 @ 20K ohms. The biggest challenge is in mounting the coils. One from my bike (no spark problem) and two I bought from eBay. ) COIL CONTINUITY TEST Remove the spark plug caps by turning them counterclockwise. Secondary testing on both coils: Coil 1- 13. Then we will need to dig deeper to isolate the problem which will be Hey everyone, coils on my bike are aftermarket and measure out to 1. FREE delivery Mon, Feb 19 . 4-0. Messages 81 Reaction score 0 Points 6 Location Yorktown, VA. CB750 New member. Oct 22, 2019 it is testing at about 5. Connect the meter to leads on 2nd coil. The original has a cloth wrap This video shows you how to determine which electrical component is bad if you're engine is not performing as expected. If you are not able to get voltage to all of these components, and you have verified that the fuse(s) are good, then you may have a failing ignition switch. Are you running points with these coils or the dyna setup? Cylinders 1 and 2 are on This link states the stock coils measured 4. Stock points - although the actual points were Since the gas tank is off, I thought it would be good opportunity to test the continuity of the ignition coils. P. So what you would do is set your multimeter to continuity mode. I've got 0,9 over stator (on all three) and 7,4 over field coil. Topic: CB750 AC output test When you did you test, was the field coil connected/powered? If not, then no voltage output is expected. Test the AC voltage from the stator wires three yellow should get about 26v ac. 1 KB · Views: 13,888 Reply. I. The result was also 0. 5 ohms in the circuit. If your motorcycle requires the large diameter DYNATEK 2191 Mendenhall Suite #105, N. I've oiled up the engine and oil pressure is good. Travis Forum Staff. It was running fine one day had carbs synched 3 days previousnext days went to start it, it started ran for 30 seconds, back fired and that was it. The magneto/rotor is measuring 1-2 OHMs. 8-9 Tester 4 CHARGING SYSTEM 2. i just did the tests again, and the stator is bad, one of the yellow wires is getting no reading at all, the fieeld coil seems to test god after subtracting the difference from touching the probes straight to each other, i also tested my old recitifer and it also tested good, how do i test the regulator to see if perhaps the stator was the I recently bought an m. Thanks! Reply. I decided to Buy a good carb rebuild kit next time. Messages 1,199 Reaction score 87 Points 48 Location Tutorial on how to test ignition coils you’ll find when repairing your engines at home regardless of brand. Is this within specs?? I get about 11. Here is a quick test to see if there is a bad condenser is on your vintage Honda CB or CL Scrambler. Replace it. T. The field coil measurements are not good. Should I be getting 12 volts? During the inspections on the ignition system on this Classic Honda 4 cylinder motorcycle we found so many issues, including, but by no means limited to, ope CB750 Guru. 000 ohms). com/hc/en-us/articles/4415317679385Understanding the design and function of the electric I just got a set of Accel coils for my '81 CB750 Custom. cb750_chris: This is how a trained Honda mechanic would service your bike if you took it in and claimed it had a charging problem. Installed it on my K4 Cb750. SO, b/w is hot and you still need a ground strap. I read for hours about coils and spark units. Lou is the genius behind this for more deta Ignition coils and caps for the SOHC Honda CB750 from '69-'78. Messages 3,476 Reaction The coil power wire (black) can break right at the coil. Join my FREE maintenance course to achieve quality service and maintenance practices for your motorcycle → https://www. I sprung for the 5 ohm Dyna Coils and haven't looked back since. Usually if you think you have Hey Guys, First of all thanks for the add. I tested power to the coils, each coil has power. Turn the key and no lights no power to the ignition switch, tested the coils and there's nothing going through them. The bike in the video is a 1982 Honda CB Welcome to The Vintage CB750 Parts Shop - World's Largest Honda CB750 Parts Store Please select your CB motorcycle then click a category to start shopping Carrying Thousands of Parts for Honda CB100 to CB1100 motorcycles - AFTER SELECTING YOUR BIKE, CHOOSE A CATEGORY TO GET STARTED The right coil does 2 &3, left outlet to 2 and right to 3. Thanks all ! Reply. it was ~ CB750 STARTER MAGNETIC SWITCH INSPECTION Before removing magnetic switch, disconnect the negative battery cable from the battery. My question is will that cause me problems with the rest of my ignition system ? 1. ignition coil ignition ignition coil removal remove the tank, the performance test perform the 3. Tried a handful of used regulators and rectifiers. Messages 2 Reaction score 0 Points 1 Location Mitchell Indiana. Their numbers are FL703-12V48 C (2-3 coil) and FL703-12v48 B (1-4 Coil). 5 ohm. dirtdigger Would this point to a bad rotor? The rotor slip ring resistance test passed as well as the continuity test on the stator. point spark tat with service limit: min. The problem is that when I rebuilt the motor an that is where the spring meets with the wire that goes to coil. $35. 06mm CB750_71_Wiring_Diagram. I'd probably recommend swapping them back to test your plug wire setup that way you can take 1 The regulator/rectifier tested ok. A test for that would be to swap the 1and 4 plug wires to opposite coil pins of the SAME coil, and the same with 2 and 3 to their coil, if the weak side switches then coil the issue. Coil Information: Ohms: 2. 6. I also tested the coils on a parts bike that I have which also has stock coils. Test results will be printed and compared to factory acceptance test criteria. 5 volts, then drops to 0 within 3 seconds. Messages 3 Reaction score 0 Points 1 Location Edmonton Alberta. The white wire measures the resistance through the field coil to ground - so the resistance should be Hi, I have a 1981 cb750c DOHC which has been having ignition issues. MN-Maxims St. Please chime in with your recommendations. 7. the bolt/nut that the 2 go on should go through points frame but it should be insulated by plastic pieces. Check System Voltage - measure DC voltage at battery terminals w/ motor off key on (~12. Should I use 3 OHM or 5 OHM coils? What is the difference between 3 OHM and 5 OHM? I Quick test there if my first sentence in post #2 already done. Messages 28 Reaction score 2 Points 3 Location Japan. So with the key on this coil is getting heat just Ignition Coils - Quantity 2 102 Degree Spark Plug Cap - Quantity 2 Straight Spark Plug Cap - Quantity 2 Spark Plug Wire - Quantity 6 ft. That's testing across B/W and yellow Is there a way to test them with a multimeter? I did search the forum but 'coil test' returned so many hits. png. Jun 8, 2022 My only doubt for being a coil is that theyre dual output and have a wasted - New ignition coils - New spark plugs and wiring - static and dynamic timed ignition Thomas . Depending on the type of coil you have, this voltage either travels from the single ignition coil into a distributor, from the coil itself into a spark plug wire, or in the case of Coil-On Ignition kit with Magna coils for the SOHC Honda CB750 from 1969-1978. Oct 28, 2020 1982 cb750 c CB750 New member. The coils are satisfactory If sparks Jump across the gap specified. i saw the accel set up. The 350F coils are USUALLY 4. It's not that used Honda coils are bad, but they are going to be 35-40 years old at this point. Sep 19, 2021 #2 Rotor can fail when hot. They are marked with a “1”. The bikes been parked for a little over a year and was running rough before This is a points and 6volt system on a 1970's motorcycle and I couldn't get it to spark after putting the bike back together a previous owner completely stri I just got my bike and I'm having a lot of issues getting XJ coils for a decent price but I can get CB750 coils locally. I've reassembled using standard block and head gaskets. If open replace. The bike has Dynojet stage 1 I have swapped out the coils. First take the leads of the multimeter and connect them 2 Pcs Ignition Coil For Honda CB650 CB750 1979-1982 CB900 1980-1982 CB1000 1983 Goldwing 1100 1980-1983 Goldwing 1200 1984-1987 Nighthawk 650 1982 Nighthawk 750 1982-1983 30500-422-003 30500-422-013. And the issue I’m having is I’m getting battery voltage of both sides of the coil with the key on. 06mm by an engineering co. I have a 1980 cb750 and am in the middle of a m unit install. Accurately test a Honda ignition coil. Hello, I’m new to the forum. 2) but The easily available Honda shop manual will tell you how to test all these things reliably and give you real answers. Messages 3,476 Reaction score 54 Points 36 Location Fort Worth TX. Recently, I treated myself to an M-Unit basic and I have everything Bike - 1975 CB750 K5 Stock air box with new filter inside Stock carbs with stock settings for clip, jets, air mixture screws, ect. 5 Excellent Coils. If either of your coils look like that they are probably shot. I take that back you can damage coils but I dont believe the 17 volts is enough if you haven't run it that long. Of the twelve test made in D, six must read low ohms and six must read very high ohms. Put cbr600 coils, new 7mm plug wires, new ngk boots, changed oil and filter, adjusted valve clearances (all between . Should I be getting 12 volts? D -- Assuming the above indicates faulty, do check the RECTIFIER diodes with a diode tester or ohmmeter capable of testing diodes and uses more than . Hello all, I'm trying to fit coils from a 81 dohc to a 76 sohc. Nov 21, 2015 #1 Hey everyone, As the title says, i need some help setting the pulse generator. The document provides information on circuit Have 78 CB750A with no spark. Can someone knowledgeable point me in the right direction? Thanks in ignition coil ignition ignition coil removal remove the tank, the performance test perform the 3. Are you running points with these coils or the dyna setup? Cylinders 1 and 2 are on It looks like the power supply stops when I put the ignition switch in the third position (go with lights) using a tester. dynaonline. The wiring for the coils seems so simple where could I CB750 Addict. The green to ground should be essentially zero - or close to it. All I could think of that would cause the issue is either a bad ground or coil no good. 3 seems low. I have not done extensive testing across all models of Honda coils. About 11. The wiring for the coils seems so simple where could I CB750 New member. the repair guide gives the ohm reading (7. This should mean that everything else is working correctly, Okay, this is the final chapter of my coil caper. Jun 22, 2017 #3 One wire from battery + to coil + and other wire from coil - to points. i havent been able to find a manual for this model that explains how exactly to set this thing. 750_cafe CB750 Member. The guy had done a few things go the bike, new tank, tires, chain, but the electrical work was left somewhat of a mess. that one Anyways, my dad has checked all the basics. 1a. Check the primary coil for continuity. Messages 8 Reaction score 4 Points 3 Location Spring city pa. N. On waste spark the Is the coil test I'm doing a valid test or have I done something wrong again? Can I get straight plug caps with the proper resistance at the automotive store? Thanks in advance Both coils check at 11k ohms on secondary and 2. DYNA-S IGNITION SYSTEM AND COIL TESTING INSPECTION Check that the rotor is not rubbing the modules or the wiring. If the problem remains on the same cylinders, then your ignition pickup is faulty. amc49 CB750 Guru. Honda Ignition Coil - 30501-300-003 - CB350F CB400F CB500 CB550 CB750 Since the coils are I've put the generator and field coil unit into the housing and need to check the resistance and continuity before mounting it on the engine. I found some ignition issues with my 81 cb750 and as a temporary fix I dropped in coils from a mk2 bandit 600 which I had lying around and bypassed the signal wire to coil 2. I thought this should be 12 CB750 Guru. 3. 5" and I have a battery issue and I'm trying to troubleshoot it. 35 to . 8 at coil post 12 at black and white wire in headlight with lights on 11. But I did recently replace them I have the black and white as positive The word “Megger” is a registered trademark WWW. Most people test the wire at the connector 3 inches away and miss the break. My problem is that they don't seem to be telling me how to test the ignition itself just how test the coils and making sure that it I own a 1980 CB750 that has had some charging system problems. The coil wires are 21" long. 95 Tax included. Staff member. Las Vegas, NV 89081 800-928-3962 www. « Last Edit: July The bike is a 1980 cb750 f . That's testing across B/W and yellow or blue colored wires. Honda, Kohler, Stihl, Husqvarna, Briggs and Strat Coil Specifications: Primary Resistance = 5 ohms; Secondary Resistance = 17,500 ohms; Mounting Holes = 90mm or 102mm (measured center to center) Mounting Posts = 2 Brand New 12V Points ignition coils to fit: Honda CB 750 K-K7 SOHC (1969-1978). Comes with hardware to attach the coils. Are those CB750 K1 have two field coils one from the original K1 and a slightly later one ( year unknown, came with a used replacement cover I ordered). Messages 26 Reaction score 2 Points 3 Location Pennsylvania. If the problem follows the coil then your new coil is faulty. Reply. 2 does that make it bad, some have said no. Can anyone which knows the electrics on the dohc models tell me if Coils do go bad after a while, and often show signs of having been overheated (goo coming out of the coil body around the plug wire). COM Circuit breaker function and test methods Practical circuit breaker testing Megger CB testing products overview Circuit Breaker testing guide They have the same part number as the pickup coils found on the cb750f. since I don't have the throttle cables hooked up I had all four carbs wedged wide open, Had to kick all cylinders, plugs out, #1 117 1/2 psi, #2 117 psi, #3 118 psi and #4 118 psi and that's a lot of jumping to get that gauge moving up Author Topic: any one know an coil upgrade for the cb750 (Read 16002 times) 0 Members and 1 Guest are viewing this topic. phillip2816. But one of the ignition control units was broken away at the frame — am I correct in assuming this lack of ground could be my whole issue with getting Hi to all I am wondering if there is an alternative to the Honda pick up coils as the are getting harder to find in the UK. 99 $ 35. I installed a 4-1 delkevic megaphone exhaust, Murray's Carbs dual vm34 carb kit, Accel super coil ignition system (Coil, and wires), new Dr8eix plugs (no resistor in boots/wires, plugs have 5kOhm resistor), and a new wiring harness. Messages 1,315 Reaction score 523 Points 113 Location Florida. Same for the Strator Coil. Messages 12 Reaction I'm working on another bike which is a Cl350. 1st of many questions is. The only thing I have not done is new coils and wires, ordered them today, so I can eliminate that, my Anyways, my dad has checked all the basics. I thought this should be 12 volts, and don't know what to think about the drop. 5 ohms between the slip rings. Honda CB 750 F-F3 SOHC (1975-1978). Any help would be greatly appreciated. I even got a different pulse gen and put it in still the same 2+3 won't light a timing lite. CB750 Enthusiast. 3 spark plug transistors 1980’s Honda CB 750 transistorized pointless ignition system troubleshooting And fixing ignition system problems Stator coil Fig. I'd probably Hi to all I am wondering if there is an alternative to the Honda pick up coils as the are getting harder to find in the UK. I don't suppose you have you old coils still. I did do a ground up restore on the bike with new coils, wires and caps, and new procom igniters. It has stock coils. If it tests good then go on to the stator If you have an older CB350 / CB450 / CB750, then there is a chance you may not have a kill switch. I believe they feed the coils They have a mounting tab that is about 1" by 1. 5 Coil Length: 80mm Performance Ignition Coil Honda CB750 CB 750 (1979-1983) Sale Regular price £19. Messages 12 Reaction https://www. Save Share Reply Quote Like. 7 volts to make the test(s). 00 on both coils. 2. common-motor. If you put a test light on the negative side To test the signal to the coil all u need is a test light. I can only fire the 2&3 cylinder from the pulsar. Got a 77 CB750 (not sure which model) that’s been bobbed by previous owner. . getting power everywhere all the way into the coils. I'm currently trying to test the alternator because everything else seems to be good. Just wondering what this means? With the bike's loom modified & ignition relay fitted in the last video we can now get around to installing the new Dyna (high power) ignition coils. Stator coil continuity test The insulation and open circuit condition of the stator coil is checked with a tester. #3 seems intermittent, outer exhaust pipes much hotter to touch/wet rag test. Any reading lower than 5 ohms on the first test or less than infinity on the second test means you have a bad rotor. Step 2 – Testing CDI (Cold Test) Here is the image we used above again as a reminder of the internal circuitry. The coil will spark if My CB750 is running OK, but the exhaust smell is unbearable, people closing windows when I stand next to them at lights . Run your bike with the points cover off in a dark environment and watch the points Electrical Electrical: Ignition Systems, Ignition Switch, Coils, Plugs, Contact Points Series 1 Model: CB750A (1976) Hondamatic Series 1 Model: CB750A (1977) Series 1 Model: CB750A (1978) CB750 New member. Ignition coils come in various types of ignition systems, but all of them take energy from the battery (usually 12 volts) and convert it to a high enough voltage (50,000 volts or more) to create a spark. The regulator/rectifier tested ok. Or fastest delivery Wed, Feb 14 . 555 Ohms and no short to ground. It should show over 11 volts with the Another test is plugs and plug wires installed on one coil and metal base of plugs well grounded. com. Had it running with the choke on. May 26, 2013 #1 how can i test my rotor and my coil? not sure whats its called but goes around the rotor to chargew battery bikes not runin g wanna test these items see if they are good . On the box however, in bold letters it states (NON-CDI). NatetheNoob CB750 New member. The bike in the video is a 1982 Honda CB A trick I did on my 81 CB750K I did is to put a Relay from the Coils to the battery. It came with a few projects, and I found yet another one when my bike died about I own a 1980 CB750 that has had some charging system problems. madmtnmotors CB750 Addict. You can bypass the ignition switch to verify this, or test I test fitted the coil just yesterday. ejanssen Discussion starter. Video also includes pin outs for three different Honda ignition coils CB750 Enthusiast. Mounting points measure 100mm center to center. com are The older coils (78-80) were 1. 6 ohms resistance, but toward the end of them and the start of the CB400F they became 4. Messages 3 Reaction score 0 Points 1 Location Denver. OEM Ref#30501/30502-300-003/013. These ignition coils have been manufactured to replace the Double disc, 296 mm, 2-piston calipers – CB750 F2 Seven Fifty Single disc, 296 mm, 2-piston calipers - CB750 Nighthawk Rear brake Single disc, 240 mm, 1-piston caliper – CB750 F2 If the above tests show a working charging system, repeat and record tests 4 through 8 after the bike is warmed up. I then tested power at the ignition switch. common to pull cover to find cracked and shed pieces of the coil coatings. I've gone through and checked what I can on the alternator itself: the resistance. Hello, Testing is very easy. 6 on the primary. also having the same trouble and mine is a 1980 cb 750f supersport. 2 at the battery 12. Part: Honda CB350 / CB360 / CB450 Ignition Coil - Sold Individually Why You Need This: Ignition trouble shooting is a big part of getting your vintage Honda up and running properly. The only coils I have off the bike right now are from my 74 Cb550. All the diagrams I have seen just have one wire coming from the ignition output on the m unit to the coils. remove the plug caps on the coil, you should have continuity between the spark plug leads. Makes me think it doesn't burn all the fuel, or very rich. A lot of the information in this video applies to general electrical troubleshooting on motorcycles The dyna coils do have a reputation for going bad. - OEM Ref. If the battery is no longer above 12. It lists test procedures that involve connecting sensors to circuit breaker contacts and supplying voltage to test closing and opening times. Jump to Latest 8. com/free-maintenanc I am having problems with my 1975 Honda CB750 super sport. That is one reason I like the replacement coils. The main power switching CB750 model. Also, forgot to mention that I bought an Ultimate Pamco electric ignition kit from vintage cb750 site. Full Member; Posts: 12 If you have a problem with your charging system, like bad connections to the stator / field coils, bad diodes in the rectifier, etc. 3 spark plug transistors transistor coil al coil 2 6 mm (1/4 minimum primary electrode spark third electrode 17- diode condenser pulser generator dar y electrode Connect meter between leads on first coil (#1, #4), turn ignition switch to 'start' position. The bike in the video is a 1 and 4 fire at the same time. Today we replaced both coils, and both cdi's. Hi everyone, new here and looking for some wiring help. Swap your ignition coils. E. CB750 Guru. This is the same ignition used by top racers over the past 2 decades. So that sounds right with what you got. Thanks in advance, Mat . 2Ω. 99. 3 ohms, likely the same coils as were found on the 550 at the time (but with slightly different spark wire length). I just installed a new wiring harness on my 78cb750 and a an electronic ignition. Below I copy and pasted it and going to put what each thing tested at. On doing the compression test my readings are: No1 220psi This document outlines circuit breaker timing tests to be performed on equipment at the Toshka 3 substation project. Field coil tested good (no short and strong pull when hooked to 12v) i just did the tests again, and the stator is bad, one of the yellow wires is getting no reading at all, the fieeld coil seems to test god after subtracting the difference from touching the probes straight to each other, i also tested my old recitifer and it also tested good, how do i test the regulator to see if perhaps the stator was the I've changed coil, switched the spark units, pulse gen tests fine, 514 ohms on yellow wires and 516 on blue wires. Good resistance on all 3 polls of the stator windings. The polarity issue change is interesting. Apr 15, 2024 1st post. 63 posts · Joined 2011 Add to quote; Only show this user The black/white carries power to the coils, and the yellow and blue wires give the coils a return to ground which, when unavailable (i. New battery turns engine over. 6 ohms on the primary side. 5VDC) ANS: 13 To start, I'll say I don't have the "proper tools" the manual wants you to have to test the alternator, the best I've got is a multi-meter that reads AC, DC, and resistance. I spoke with Murray from Murray's Carbs who recommended an accel kit if I wanted to spend a bit of money so I bought one and received the 14403 kit with 3 ohm coils. No dice, still not spark from that coil. This vi Coil voltage test: 13. Either way, that specific wire, along with a few others didn't look It MAY have been like this when I was testing my coils, or it came off in the process of me taking my coils out. Test your test light by connecting one side to ground and touching the probe to CB750 K6-76 970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback) CB750 K2-75 Parts assembled to a stock K2 Updates of the CB750 K6 -1976 CB200 Ignition Coil Testing. I also have a set of coils from a 1978 CB750 F which seem identical to the one coil from my bike. not normal unless screwing around with coils, and doing that incorrectly will simply fry the new ones. unit blue. Apr 21, 2023 #3 The CB900F service manual chapter labeled "Electrical" has a set of multimeter tests to check the coils and spark units. My options are to do a minimal but expensive upgrade with a M Vintage Motorcycle Rescue 750, Old Dyna Coils being replaced by new OEM Type coils that were bought on ebay. guessing there's a but Three phase charging system inspection and maintenance for all pre 79 SHOC4 motorcycles. Check out the pictures below and tell me The CB500/550 coils are electrically identical to the post-1975 CB750 coils, at 4. Im guessing the #1 is missing intermittently, causing unburned fuel to ignite in the exhaust. I can't take credit for this as I am not the creator. He found that 1 coil was cracked and both cdi's looked burnt. Are you getting 12V at the coils? (again, with the key in the "run" position) 5. Hopefully someone can help! (Oddly enough, it seems as though the new rotor I bought is testing bad). On the second test between one slip ring and the engine you should see infinity on the meter. The battery/coil lead can be singular. It is very possible I I have swapped coils over and the fault is still the same on coil 1 (which is now coil 2 if that makes sense) so I'm assuming the fault lies further back. New coils aren't too expensive, these from 4into1. 81. No smoke. If there are no continuity I have just rebuilt my CB750F DOHC engine,, reseated the Valves and clearance,, honed the barrels New rings Genuine Honda ,, I have not fitted the Carburettors yet But i have found a combination of bad/poor caps, coils were fine. If you have swapped out the points and condensers on your Honda CB350, CL350 Scrambler, SL350 / CB360, CL360 Scrambler, CJ360 / CB450, CL450 Scrambler or CB500T and you are still The new coils I’ve gotten both read 2. When testing the pulser assy I Connect meter between leads on first coil (#1, #4), turn ignition switch to 'start' position. The coil resistance should fall between . themotorcyclemd. 003 +-. The coils from a 76 have no polarity stamped on them, but the 81 coils do. from what i have seen there should be adjustment markers hi, please can someone tell me the correct way the blue yellow black and white are on the coils cb750FB 1981uk model coil 1-4 blue to the + pos terminal black/white to the - neg terminal theses are looped together to each coil coil 2-3 yellow to the + pos terminal Hey first time posting here. Crank engine and the light should pulse as the coil receives a signal. 5 at 5k. Still no spark. com/honda-350-ignition-electricalThe first thing to check out when diagnosing a poor running vintage Honda motorcycle engine is the Hello, I’m new to the forum. Use this kit with the stock points ignition or an electronic ignition. On my 1973 CB750F Bike was running fine, then started running pretty rough after sitting in the shop most of the winter. Iswitched the blue wire to the 1+4 cyl coil over to the 2+3 coil and wala it lites up the timing lite hooked up to 2+3. Messages 21 Reaction score 4 Did you test each coil to make sure they weren't grounding not sure how. A way to check the field coil/stator with a running bike is to disconnect the voltage regulator, and with a meter connected (to either the stator output leads (measured from yellow trying test stator -field coil ohms what are good numbers. Messages 83 Reaction score 0 Points 6 Location arizona. COMPRESION TOO HIGH? I've just completed a compression test. Meter jumps to 9. Test results from each coil: Not stock brandless coils currently on bike - Primary Best test of an inductive type coil? Have known good plug wire and grounded plug on it with a wide gap bigger than your needed one and then power up coil with 12V and ground In this video we perform resistance checks on the Primary & Secondary windings of the ignition coils, inspect & test the plug caps & take a closer look at the ignition points too I'll be When I check my primary i get around 4. Once it is disconnected, set your multimeter to the ohms setting and touch the leads to the terminals on My bike is a CB750, 836 big bore kit, aftermarket exhaust, running pod filters if that makes any difference. c-c mounting points) The coils are not polarity sensitive, and are not marked + or - for that reason. I have one, extra they all work on 2&3 cylinder side. As I understand I have to remove the ATU to get the cable out, is this correct nothing in the manual and nothing about the air gap. I have 3 wires coming out of the coil. I did a forum search and found Ol Hoss's directions for testing Vintage Motorcycle Rescue 750, Old Dyna Coils being replaced by new OEM Type coils that were bought on ebay. I can fire both coils when hooked up to 2&3. Rather I should say ~ CB750 IGNITION COIL SPARK GAP TEST Check the coil output on an electrical tester. Check the voltage at the coil connections. So that when the coils have power, power comes directly from the battery instead of through all the switches in the wiring harness. Last edited: Jul 20, 2019. 00. I have looked at the wiring diagram, but not sure what would cause zero spark. The Field coil s CB750 New member. Hook one end to battery positive and the other end to the - side of coil. Also only one of mine test bad the other is 517 ohms is it possible to change one out and not the pair. Messages 1 Reaction score 0 Points 1 Location Canada. Test the primary windings for I looked over the coils and the cases are good. If shorts again search for short circuit. 5 on one field coil, and 5 on a spare one. Works good on my chop. You've got the stator, CDI and coil/wires. Post reply Insert quotes During the inspections on the ignition system on this Classic Honda 4 cylinder motorcycle we found so many issues, including, but by no means limited to, ope Well it's been a while since I messed with my project, finally got my 12mm adapter for the compression tester. Add to Cart This item is a recurring or deferred purchase. Aug 10, 2012 It has a detailed inspection procedure to test the electronic ignition Read More:>> Testing Purge Valve using a Multimeter. May 5, 2016 #3 Definitely literally catching fire. 2 out of 5 stars. For secondary you measure one plug hole to the other of the same coil. On older cars they used to run a lower voltage coil and on startup it would bypass a resistor and run direct battery voltage to make higher spark voltage for start up. The problem is that when I rebuilt the motor an To test the coil, you will need to disconnect it from the CDI box. Wiring is “ custom” to say the least. Electrical Electrical: Ignition Systems, Ignition Switch, Coils, Plugs, Contact Points Series 1 Model: CB750A (1976) Hondamatic Series 1 Model: CB750A (1977) Series 1 Model: CB750A (1978) Series 1 Model: CB750F (1975) Supersport Series 1 Model: CB750F (1976) Series 1 Model: CB750F (1977) Series 1 Model: CB750F (1978) Series 1 Model: CB750K (1969) Standard Electrical Engineer Evan from RM Stator shows you how to install a new pair of ignition coils on your DOHC Honda CB. The wiring for the coils seems so simple where could I For the first test you should see between 5 and 5. Just a quickie run through on testing you motorcycles coils and Ignition system - this was picked from Honda but it's all pretty universal -- For IC igniter Hello, I’m new to the forum. xx volts feeding the primary side on both coils. 90 @20K ohms & Coil 2 - 15. Messages 4 Reaction score 0 Points 1 Location Portland. I have it 95% done but can not seem to get spark. Fits: Will it still be able to use the stock coils ? My bike is a 1977 CB750F2 Supersport. Nothing out of the coils for spark. Messages 427 CB750 Member. Everything works BUT! I’m not getting any spark. Should I replace it? I am also looking at replacing the stock coils and possibly some wiring as well. This is a great kit to modernize the stock ignition system! The Ignition Systemis a complete self-contained electronic ignition system built with the latest state-of-the-art engineering. 8 at black and white wire in headlight 12 at black and white wire going to coils 11. 004" Heya CB750 fam! I recently bought my first bike (a 1975 750F0 Supersport) and I'm loving it. Batten, Apr 28, 2016 #8. Also only one of mine test bad the other is 517 ohms is it Dyna / Dynatek ignition kit with Magna coils for the SOHC Honda CB750 from 1969-1978. Really Mostly concerning CDI boxes and ignition coils for more technical information feel free to message me, I'll send you some good info 1. My problem is that they don't seem to be telling me how to test the ignition itself just how test the coils and making sure that it Electrical Engineer Evan from RM Stator shows you how to install a new pair of ignition coils on your DOHC Honda CB. If you have no spark at the plugs you need to work backwards testing resistance (ohms) new sparkplugs check caps, HT leads, coil (1 coil for 1&4 1 coil for 2&3) replace if any found faulty. I got the set from Z1 Enterprises. On my multimeter it shows 6. A few questions--Is it OK to just swap the old coils with the new ones? Is there any other componeny of the electrical system I'll need to tinker with?--The instructions recommend changing the (main?) jet in the carbs to accomodate the new coils. points open), causes the coils to take the next available path to ground - across the plugs, exactly what you're after. Coils are testing 3. Basically, no voltage is making it back to my battery. The coils using those have to be 3 ohm resistance, if lower say bye-bye ignitors. Messages 2 Reaction score 0 Points 1 Location mooresville, NC, united states. we went on a long bike trip this summer and his 750 ran fine until it sat outside for a week or so after the trip. Check the coil resistances of primary and secondary wiring and the plug end/connector resistances. This method requires us to test the cdi for continuity. 29 posts · Joined 2011 Add to quote; Only show this user #1 · May 5, 2014. Dunno if it's "by the book" or This is a test of my HEI ignition on my 1976 Honda CB750. We will check the coils by removing My buddy and i are working on his 72 CB750 at the moment. Everything ohms out correctly, yet the white pickup coil wire has continuity to ground. Also what is stock coil resistance? Honda CB750 Ignition Coil - Stock type for contact point ignitions. looks cool but lookiing for something more to CB750 model. Apr 24, 2024 #2 What circuit is it blowing? Reply. GAP: 8 mm (0. Messages 3,476 Reaction score 54 Points 36 Location Replacement ignition coil for points style ignitions on Honda 69-78 CB750 models. 4K views 4 replies 3 participants last post by 8AD May 10, 2017. Ensure battery is fully charged before spark check. I can repeat this consistently. Im just cracking into a cb750F and couldnt be more excited. I may have a bad coil (or just caps), and a guy at a local shop told me to try plugging plugs 1/4 into 2/3 and vise versa to check. Messages 152 Reaction score 44 Points 28 Location North Anston UK. But I run them and dont have a problem. This is a great kit to modernize the stock ignition system! The Dyna S Ignition System is Haven't done another test yet, but wanted to update. But The coils have a good ground and I test both and they work just fine. Pulled the stator apart and started testing. AndyS. I recently picked up a 1979 cb750 project bike. Assuming your plugging in a spare spark plug and grounding it on the engine to visually confirming spark across the gap and, assuming the coil you got came with attached plug wires that only leaves the spark plug caps. tmittelstaedt CB750 Member. In this case, once current exits the coils it will merge into a single 12v positive black wire connection immediately. There's really no way to use the original CB750 coil mounting brackets as the CB750 coils need the bracket to go under the coil whereas the CB900 coil bracket HAS to go on top of the coil due to the coil input wires being situated in the rear (facing the seat) of the coil. I found a great PDF on these charging systems and how to run tests. If the coils read fine, then check the pick-up coils. On my shop book, it says that "the rated resistance value [between the two lead wires of the Field Coil] is 7. 3150 In. The way the numbers are cast into the coils, show distinct variation in the size and shape of the 48 in the number. the field coil reads about 7 ohms, and all the stator whatevers read about 0. 3 ohms on the primary side. Turn the rotor to the advanced position I checked the valve lash, all 16 fell within specs . note the '978 honda motor co. I've put the generator and field coil unit into the housing and need to check the resistance and continuity before mounting it on the engine. Emarcottesr CB750 I'm working on another bike which is a Cl350. Also all 3 yellow stator wires ohm out correctly yet have continuity between all 3. 1. 9 ohm to 3. I tested the voltage going to the coil and only getting 8 or so volts. 0 ohms. There are some CDI test in the Clymer manual, haven't tried any of those. II. #30501/30502-300-003/013 (100mm. 0v battery reading while at idle & throughout rpm range. Thanks to anyone for some help. since I don't have the throttle cables hooked up I had all four carbs wedged wide open, Had to kick all cylinders, plugs out, #1 117 1/2 psi, #2 117 psi, #3 118 psi and #4 118 psi and that's a lot of jumping to get that gauge moving up Cant really damage coils, if you have spark they are probably ok. Messages 1 Reaction score 0 Points 1 Location Maine. The stock coils do not have replacable plug wires. Make sure you have a crimp tool or buy the recommended one that Z1 sells. 001, checked timing, performed a leakdown test on all 4 cylinders all are less than 15%. They are under i connected a multimeter to the white and black wires, and have gotten a reading of 3. 4. When cold they measured 25k ohms (I think) about 3 weeks ago. The factory instruction manual on that ignition called for Hello all, new to the forum. Kill switch to run again and key on with your suspect coil wired to the black and the blue or yellow wire off hanging in space. If they both test Primary you measure one coil small wire to the other (coil + to coil -). Now going to test the field coil and stator. Oct 23, 2023 I can set up the points ignition with a continuity tester and be within one or two degrees of proper timing. MEGGER. Turn the rotor to the advanced position 1. I have three Honda CB200 ignition coils. I have no spark at any of the four plugs. Should I replace it? I am also looking at replacing the The dyna coils do have a reputation for going bad. I get my constant 12v to the pamco, get 4v out of pamco to coils. i ,was wondering if you have a weak spark from bad coils could it I have not done extensive testing across all models of Honda coils. By continuing, I In this video I explain the oft-feared electrical system. Either way, that specific wire, along with a few others didn't look great. If you use one wire to do both battery and points you get a direct short that To start, I'll say I don't have the "proper tools" the manual wants you to have to test the alternator, the best I've got is a multi-meter that reads AC, DC, and resistance. May 21, 2019 impossible any other way except one half of a coil being bad. And then twinned on the point lead for the other coil. Recheck the stator resistances, probably all good. I'm trying to test coil resistance but I get a reading of 0. Quantity. Test it out the box. Today I bought new NGK boots, new spark plug wires, and nifty NGK wire connectors. The engine has new pistons, rings, valves, valve guides, bearings and the head was shaved by 0. I Hi, I have an 81 cb750c with 3,800 miles that I bought as a winter project but I cant quite get it running right. 1 at black and white wire going to coils with lights on 11. 631girl Guest; any one know an coil upgrade for the cb750 « on: January 03, 2010, 04:28:15 pm » looking for a coil set up to exchange the stock coils. 8Ω. 2 Ohms no short to ground, the manual says it should be at 7. The wiring diagram does not show polarity (at least the ones I could find). 3 ohms primary resistance. Is there any other test i If you have good spark on all, then problem is elsewhere fuel or compression. If you use one wire to do both battery and points you get a direct short that Hello all, new to the forum. 1 at coil post with lights on Electrical Engineer Evan from RM Stator shows you how to install a new stator and charging field coil rotor on your DOHC Honda CB. 5 ohm coils there is a ballast resistor worth 1. Only if the unit can read the primary side (+), most tachs read the negative side, which is split in two coils. You have to terminate the spark plug cables yourself for the lengths you need. Emarcottesr CB750 Member. 65 ohms. (this eliminates the faulty I have a 1976 Honda CB750 K6 that is my first true rebuild. The engine turns over and over really well, strong. Dec 21, 2012 #2 The plug wires are hard wired to the coils. Continuity: Good No continuity: Replace Just bought a 1979 CB 750 F. That is, the one coil generates the voltage and it flows out both plugs wires at the same time. Testing for 12v positive power at the coils. With the 1. Initial inspection. And when I hook the test light up to the blue or yellow wire coming from the coil the light stays illuminated. The items I'm trying to install are refeered to as spark units on a diagram I have. 0 volts at idle and 11. 4 & 3. The stator tested around . Top Contributor. 1977 CB750 (acquired project) 1979 CM400T (rider), According to my test light the coil is getting heat, so I assume that it is bad and get a new coil. 55 ohms with a max of . I have over 20 early Honda Author Topic: Testing CB750 K2 charging system (Read 4859 times) 0 Members and 1 Guest are viewing this topic. Still in search of spark on my ‘83 CB750F. I can swap both spark ignitors TI . Take that blue or yellow and touch it to a good ground for a second (no longer to preserve coil) and then break the ground, the coil should spark a plug A trick I did on my 81 CB750K I did is to put a Relay from the Coils to the battery. If you put a test light on the negative side Mostly concerning CDI boxes and ignition coils for more technical information feel free to message me, I'll send you some good info Check out our article for more details: https://support. The only power I can find is Having charging problems on my 74 CB750 (what else is new). 7 ohms at 200 on both coils. I believe there's a link to that manual somewhere on this forum. However after testing the three yellow wires on the stator, I found that that all of them had continuity with each other, but there is little/no resistance (<. 5 ohm coils, in 81 they went to 3 ohm coils. 7. Sep 26, 2023 #5 amc49 said: Well it's been a while since I messed with my project, finally got my 12mm adapter for the compression tester. Reactions: animaljim. “ where are the white and green field coil wires supposed to be So working on getting this 78 cb750a up and running. Rewired the whole bike. Wiggle wires while you check ohms. I’m trying to diagnose a 0. Switch power to on on black/white wire on that coil and simply touch the blue or yellow wire to ground for a few seconds then quickly break the connection. 6V, then measure It MAY have been like this when I was testing my coils, or it came off in the process of me taking my coils out. #30300461405 Does anyone know of a part to replace with, or a new ignition system that I could throw on? I didnt want to go as far as the dyna 2000 system. As per the instructions on the wire Hi all, I’m at the stage of my build (cafe racer not restoring) that I’m looking at wiring, controls and instrumentation. Last edited: Apr 14, 2024. Will coils Since I am using the stock advance and the reluctor sensor and rotor line up a the F mark I am hoping timing will not be an issue. It is complete except for the last stretch of wiring. Paul Minnesota. Posted by Brian Stanton on The field coil tests at 8. ejokcps hrz mog ziauhigi qvz urqpf fwafnm swfnp jxpnlykq hczsufed