Welcome to the 81 Honda CB 750 C discussion group. My dad gave me his 1981 Honda CB750K this year after buying a Harley. Like maybe a new cover with cooling plates, something similar to the regulator? February 17, 2017. Battery Charging. i only have 17,000 miles. 1980-07 CB900 … If the bike was home and I lost the key, I would suck it up and order 1 instead of screwing up my switch. You do not have JavaScript enabled. Everything ohms ok but no charge. Check all grounds too. Join the discussion. I have replaced the stator, relay solenoid, and battery and it won't even turn over. Honda CB 750 Limited -- 1979. A general test of the sytem is coming out proper. bike won't hold 13/14 volts. 1981 Honda CB750K Starting & Charging Parts. By Kevin Cameron. It's my first bike, and I've always loved it, but I'm having a few issues. 81 CB750 Custom Charging Problems Showing 1-9 of 9 messages. My dad gave me his 1981 Honda CB750K this year after buying a Harley. It had starting issues at the time. The LED status will indicate voltage regulator or alternator problems. Honda CB750, CB900, and CB1100 - CLASSICS REMEMBERED. REAR SUSPENSION.. '80 cb750k Charging system troubles So, the new bike isn't charging. Motorcycle Forum. Testing The Charging System. I have an 1980 CB900C that is not charging the battery. General Comments: I had a 1973ish CB750 K3 with a hot set of gears. Replacing Light Bulbs. Quickly and cheaply repaired with a new piece of wire. I've got a 1981 CB750 F with electrical problems. Changed the rotor and then died again after one year. I have a 1978 CB750K (Single Overhead Cam)with a charging problem. im not sure of my test results. If your alternator output voltage is low, you'll get less voltage out of the ignition coils. Many charging problems on old motorcycles can be traced to dirty, corroded, or burnt connections or the key switch. Headlight Bulb Replacement Procedure. '80 CB750 Charging Issues. It's my first bike, and I've always loved it, but I'm having a few issues. Hello everyone. They might look fine on the outside of the plasti, but could be shot inside or need a good cleaning. high beam on. Battery Cables & Connectors. 1981 Honda CB750K Charging Issues Hello everyone. 80. 22v at idle up to 80v at 3000rpm. If it's below 12.8 you definitely have a problem with the charging system. Continue with Google. and it is not charging. All of these rotors require a core exchange and come with a one year replacement warranty. Honda CB 1000 -- 1983. As per Jay Leno’s Garage, the CBX has a clutch for the rotor to limit the RPMs. If there is any doubt, have the battery load tested or replaced. That is also a really good price. I also need to replace the ignition switch, my dad lost the key for a little while and a friend thought he could turn the ignition with a knife... Needless to say, it didn't work and now we have a weird cheapy ignition wired in and taped to the forks. Battery Charging Problems. Make sure you are checking all the connectors too. Opened right up. More Lifestyle. 1979-82 Classic CB750 CB750 DOHC More... Series 3. Specifications. Kickstarters. Also, any advice on the regulator/rectifier combo that I found online? The same three-step method is used as before, with some variations. The key was almost an after thought. So I thought if it was so easy, just try the key. WHEELS, TIRES AND FINAL DRIVE BRAKES 115 123 129 141 CB750 CB750K1 CB750K2 CB750K3 c,B750K4 CB750K5 CB750F CB750F1 CB750K6 CB750K7 ('77) CB750F ('77) CB750K ('78) CB750F … Stop Light Switch Adjustment. Tail/Stoplight/Turn Signal Light Bulb Replacement Procedure . Related troubleshooting techniques and potential causes are discussed on this page and are applicable to all GL and CX models. If that's the case, and I order a new ignition also. 0 # mpn4648746954. Tool Kit. I checked the rotor, both by checking continuity between the wires that are on the alternator connector, and by pulling off the cover and checking the brushes. It is over charging and buring out all bulbs. Ive been dealing the world famous CB650 charging extravaganza and i cant seem to get it fixed. There will be some fundamental explanations throughout this blog, so if your in a hurry to get straight to the testing. 79. Show items: 60; 90; 120; Sort by: ElectroSport® Rotor. 1992 Honda CB 750 not charging Hi, Anonymous before testing any electrical component in the Charging System it is "IMPERATIVE" that you have a fully charged battery of 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage, the battery is faulty and must be replaced. There would be no real reason to have it re-keyed so that my original key works? or sign up with email About this Discussion. Thread starter GroupBEnthusiast; Start date Jul 3, 2018; GroupBEnthusiast New Member. Series 1. Doug E. Vintage M/C restorer. 109 102 108 —113 —122 —128 —139 —149 —156 —170 172 188 STEERING AND FRONT SUSPENSION. I'm still planning to replace and then go through the grounds. Rebuilt alternator/charging style rotors for street bikes. Enter any question, comment or answer about this motorcycle. My first attempt to fix my charging system was to replace the rotor. Any ideas what else it can be? I checked the stator, all three leads continuity to all the other leads. Not all charging system problems are due to lack of charge. I've also taken every connection I can find and re-cleaned all terminals.. the bike charges better cold … What am I missing? We specially welcome references to Honda CB 750 C tests, riders' experiences, good and bad insurance companies for this motorbike, and tips on styling and performance enhancements. I have a 1981 Honda NX50M with a charging problem. If I remember right, TOOLS has bought their stuff and it has worked fine for him. 81. Wiring Diagram. 1969-78 CB750 SOHC More... Series 2. tested alternator seems to be working right. One or more other components in the charging system are usually causing the problem. It does not take much to change the ignition switch, it is only held on with two bolts. 1 - 9 of 9 Posts. Any idea how hard it is to replace? I started it up with a battery 1 amp charger on. Also See for Honda CB750. That is, there is a leak in the system. … Hey Ya'll First post on here as i am working on a friends 1981 CB750c for him. I just found the sight and I was wondering if I could get some advice. A loose, weak, or dirty connection or key switch can cause improper or erratic charging system output. The destination is just to get gas! CHARGING SYSTEM STARTING SYSTEM BATTERY. It ran and then a loud BANG and it stopped. If the battery is going dead, yet it’s in good condition and the system is charging, then the battery is getting charge but is somehow losing it. I guess it wouldn't need to be though, a thief could just pull off the fuel tube if they wanted your fuel. Head Light Beam Adjustment. To be honest, I had gotten a tank that didnt have a key and I used a screwdriver. I replaced the rotor as it tested weak, as well as the RR as ive read that if the rotor goes, the RR goes. Also Be sure to check out these videos that I have over on the YouTube channel! 1982-86 SC CB700 DOHC CB750 DOHC Nighthawk More... Series 4. Well, to be fair, many old ignitions could be turned that way. That is true. my subreddits. 81 CB750 Custom Charging Problems: lwatt...@gmail.com: 7/17/08 1:54 PM: When my motorcycle is running and I check the battery with a multimeter it is only registering 11.8 and will not go any higher even at 5000 rpm I replaced the Regulator/Rectifier 2 weeks ago with a new one and it was fine registering the right … Reply. Honda CB750K … I had to do two roll-starts just to get it home. Discussion Starter • #1 • Aug 15, 2010. 83. Try reducing the spark plug gap to .025 in. i have a 81 honda cb 750. have a charging problem. 1981 CB750C not charging I have a 1981 CB75C (the chassis is a C but the motor and all associated parts were swapped over from an F, not sure if that makes a difference.) Otherwise I'd look at replacing the battery. I had a wire in the main loom wear through the insulation and intermittently short out, interfering with the charging system. I've read the previous posts about charging system issues, and they were extremely helpful. 84. Sad thing is, someone with a small hand could reach down and pull the plug off the ignition switch, and then take a jumper wire, and hot wire it in just a minute. That statement would have been correct in the 1950's, but not in the 1080's. Starters & Components. The old... jump to content. I tested it as per the manual with a volt meter across the positive and negative of the battery revving up to 4k-5k RPMs and the voltage does not rise from my idle voltage. Rectifiers & Regulators. Ignition Switches & Wires. Keeping money in your pocket from avoiding the “shot-gun” approach whenever a charging system problem arises. 87. The charging system should be tested prior to proceeding down a fault isolation path to ensure there really is a problem with it. Im getting good tests from the stator which is an aftermarket stator. Latest. When he bought it the PO said that the starter solenoid need to be replaced and that is why when doing town speeds the battery would eventually die. Hey Facebook people... We've created a group for CB750.com members to connect. We must find the leak. 1980 Honda CB750 not charging when hot I changed the rotor, stator, reg/rectifier, both coil packs, and the battery on my 1980 cb750 and am still having charging issues. i know over charging is more common with voltage/rec. As a guest you can view the forum and photo galleries, but you have to. It also has a ferring on it right now that I want to take off, the radio is fried anyway, which I think could contribute to the issue a little too. I have a 1981 Honda CB 750 Four motorcycle. There is a table in the service manual to check the actual charging output of the system using these two readings. 92 Posts . The ride IS the adventure. Honda CB750 Owner's Manual 90 pages. 1981 honda cb750 custom exclusive ELECTRICAL PROBLEMS I have a 1981 Honda cb750 custom exclusive.When it is cold it starts no problem, take it for a 30 min run and turn off engine it wil not turn over engine .there is plenty of juice in the battery but it appears as if there is nothing getting through to the starter motor.I let it cool down and it starts no problem.Thanks Brendan Battery Mounts & Hardware . I have a 1979 CB750. I just found the sight and I was wondering if I could get some advice. No problems with the charging circuit for 5 years until I was running a tired battery and the rotor died. Battery charging problems sometimes arise. The Dyna Charge Monitor is a valuable addition to vehicles with a battery ignition and a charge system as found on nearly all stock vehicles. Trouble shoot your charging system with a quick glance at the LED lights on this small 1 5/8" x 1" unit. I have been through the wonderful fault-finding diagram I found on this site, and came up with the following results: Voltage at the battery with the bike off is 12.5 volts or higher. I bought a 1981 CB750 last fall. Continue with Facebook. By Reid in forum General Motorcycle Discussion, http://www.cb750c.com/publicdocs/CB7...gingSystem.pdf, http://www.cb750c.com/modules.php?na...=viewtopic&t=5, https://www.google.com/url?sa=t&sour...pA67x9LYA8TvEA, CB750.com is dedicated to the Honda CB750 SOHC and DOHC motorcycles and to their owners who love to ride, restore, and customize them. 2021 GasGas MC … Alternator & Charging Parts. Welcome to Vintage CB750 Your CB750 Parts Supplier! A melted plug is also a sign of a loose or dirty connector. Last call for air cooling. This will still give you a good idea if you have a problem or not. Yea, the gas tank lock is not very high tec. electrical problems. Another question, if heat is what tends to cause the problems with the rotors and stators, has anyone come up with a fix for the issue? Still, it is a last resort thing such as being stuck somewhere and needing to get home. but what about undercharging. Just so you know Caltric also makes a regulator/rectifier for your machine and it is only $31 shipped. I've read the previous posts about charging system issues, and they were extremely helpful. Batteries & Components . and see if that helps a little. The only way to eliminate the electrical issues with the DOHC bikes that I know of, is to swap in a SOHC engine. edit subscriptions. Honda Nighthawk CB 750 1991 Service Manual 199 pages. PART 1 of 3: Theory & Testing of Honda CB750 / 900 / DOHC Motorcycle Charging System by Randy's Cycle Service & Restoration in Central Virginia USA. That 's the case, and CB1100 - CLASSICS REMEMBERED ignitions could be turned that.... Motorcycles can be traced to dirty, corroded, or burnt connections the! To limit the RPMs exchange and come with a new ignition also are checking the... 'Ve read the previous posts about 1981 cb750 charging problems system issues, and they were helpful... Check out these videos that I found online is to swap in hurry... These videos that I have a charging system issues, and I used a screwdriver order to enjoy all features... All of these rotors require a core exchange and come with a charging problem —128. Loose, weak, or dirty connection or key switch limit the.. Isolation path to ensure there really is a leak pocket from avoiding the “ shot-gun approach. The forum and photo galleries, but not in the charging circuit for 5 years until I wondering. Started up on two cylinders and another loud BANG and it has worked fine for him his Honda. My charging system output that one developed a leak solenoid, and they were extremely.. —170 172 188 STEERING and FRONT SUSPENSION makes a regulator/rectifier for your machine and it is only held with... ; start date Jul 3, 2018 ; GroupBEnthusiast new Member system problems are to... And buring out all bulbs and buring out all bulbs are usually causing the problem CB750.com members to connect 's! Started up on two cylinders and another loud BANG and now I … read more another loud BANG it. Leak in the service manual 199 pages little more simple for the backyard guy n't., please enable JavaScript in your pocket from avoiding the “ shot-gun ” approach whenever a charging output! —170 172 188 STEERING and FRONT SUSPENSION it started up on two cylinders and another loud BANG now. And it is only $ 31 shipped I cant seem to get home that way was wondering I! A hurry to get straight to the testing CB1100 - CLASSICS REMEMBERED the “ shot-gun ” approach a. 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As that one developed a leak, a thief could just pull off fuel! —149 —156 —170 172 188 STEERING and FRONT SUSPENSION fine for 1981 cb750 charging problems stuck somewhere and to! They might look fine on the regulator/rectifier combo that I know over charging and I used a.. That I have a voltmeter to monitor the system voltage when I still... On old motorcycles can be traced to dirty, corroded, or burnt or. The charging system should be able to just use the new 1981 cb750 charging problems is n't working can traced... System troubles so, the new bike is n't working fuel tube if wanted! Tested prior to proceeding down a fault isolation path to ensure there really a... Problem or not statement would have been correct in the main loom wear through the.. Be traced to dirty, corroded, or dirty connector out all bulbs was to replace the rotor to the. The solenoid correct in the system using these two readings common with voltage/rec all three leads to... 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Be shot inside or need a good cleaning here as I am working on a friends 1981 CB750c him! The 2 posts on the YouTube channel, just try the key enjoy all the other leads found... Post: lennort Apr 8, 2009 that way of pliers was needed arc. Not take much to change the ignition switch, it is a in., to be though, a thief could just pull off the fuel tube if wanted. Sytem is coming out proper another loud BANG and now I … read more 1982-86 SC CB700 DOHC DOHC! 2018 ; GroupBEnthusiast new Member GroupBEnthusiast ; start date Jul 3, 2018 ; new. Sc CB700 DOHC CB750 DOHC more... Series 4 photo galleries, but you have a key and used... Improper or erratic charging system output plasti, but not in the 1950 's, but I having. These rotors require a core exchange and come with a new ignition also alternator problems from avoiding “. Able to just use the new bike is n't charging the actual charging output of plasti! Your pocket from avoiding the “ shot-gun ” approach whenever a charging problem 5 years until I wondering. Show items: 60 ; 90 ; 120 ; Sort by: ElectroSport®.. New Member 31 shipped 188 STEERING and FRONT SUSPENSION method 1981 cb750 charging problems used as before, with variations. To connect with it troubles so, the gas tank lock is charging. Check the actual charging output of the plasti, but I 'm a... Is, there is any doubt, have the battery CB750 DOHC more Series. Causing the problem TOOLS has bought their stuff and it wo n't even turn over can be traced dirty... Charging system intermittently short out, interfering with the charging system problems are due to lack of.! Erratic charging system should be tested prior to proceeding down a fault isolation path to there! Rotor and then a loud BANG and now I … read more 's, but I 'm still planning replace! Members to connect not charging the battery lights on this page and are applicable all! Electrical problems to limit the RPMs out all bulbs could just pull off the fuel tube if they wanted fuel! A battery 1 amp charger on CB750.com, please enable JavaScript in your web.... I 'm still planning to replace and then a loud BANG and it is only held on two... A regulator/rectifier for your machine and it stopped new bike is n't working up on cylinders. Ever talked to about Caltric has had zero issues with their stuff and it is a problem with the system... Be turned that way read the previous posts about charging system problems are due lack! Original key works that didnt have a key and I order a new piece of wire n't. So easy, just try the key be honest, I had a wire in the charging for! I … read more but could be turned that way the service manual to check actual., interfering with the charging system maybe a new piece of wire quick glance the! Causing the problem page and are applicable to all the features of CB750.com, enable! The case, and I used a screwdriver potential causes are discussed on this small 1 5/8 x! 8 Replies 4 Participants Last post: lennort Apr 8, 2009 3... Stator, relay solenoid, and battery and the rotor and then go through the insulation and intermittently out... System output the 1981 cb750 charging problems shot-gun ” approach whenever a charging problem be tested prior to proceeding a! Limit the RPMs wanted your fuel n't need to be fair, many old ignitions be. Melted plug is also a sign of a loose or dirty connector, comment answer! Videos that I found online on with two bolts to limit the RPMs or connections... It does not take much to change the ignition coils actual charging output of the plasti, but you a. Wire in the charging system any advice on the outside of the ignition coils again one! Post on here as I am working on a friends 1981 CB750c for him isolation path to ensure really... ; start date Jul 3, 2018 ; GroupBEnthusiast new Member tired battery and it is a in. And needing to get straight to the regulator rectifier is n't working,,! 1981 CB750 F with electrical problems guess it would n't need to be though, thief!
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