Batteries & Components . I'm still planning to replace and then go through the grounds. 0 # mpn4648746954. Join the discussion. Hey Ya'll First post on here as i am working on a friends 1981 CB750c for him. 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 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. Opened right up. 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. Continue with Google. I had to do two roll-starts just to get it home. The same three-step method is used as before, with some variations. I have a 1978 CB750K (Single Overhead Cam)with a charging problem. Starters & Components. and see if that helps a little. Battery Charging. 1969-78 CB750 SOHC More... Series 2. The key was almost an after thought. bike won't hold 13/14 volts. Keeping money in your pocket from avoiding the “shot-gun” approach whenever a charging system problem arises. Topic: 1981 CB650 Charging Problems ... Hello all, I recently purchased a 1981 Honda CB650 Custom with 11K miles on it, and discovered that the bike has a charging problem. I just cannot understand people who think you can turn a key switch with a knife/screwdriver... Life is not about the number of breaths, you take, but the moments that take your breath away. I just found the sight and I was wondering if I could get some advice. My first attempt to fix my charging system was to replace the rotor. In order to enjoy all the features of CB750.com, please enable JavaScript in your web browser. One or more other components in the charging system are usually causing the problem. That is also a really good price. and it is not charging. Reply. It's my first bike, and I've always loved it, but I'm having a few issues. Then I got another tank as that one developed a leak. You do not have JavaScript enabled. Welcome to the 81 Honda CB 750 C discussion group. 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 … The only way to eliminate the electrical issues with the DOHC bikes that I know of, is to swap in a SOHC engine. Like maybe a new cover with cooling plates, something similar to the regulator? 22v at idle up to 80v at 3000rpm. The LED status will indicate voltage regulator or alternator problems. i know over charging is more common with voltage/rec. but what about undercharging. I replaced the rotor as it tested weak, as well as the RR as ive read that if the rotor goes, the RR goes. 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. Quickly and cheaply repaired with a new piece of wire. I have a voltmeter to monitor the system voltage when I'm riding. Battery Charging Problems. As a guest you can view the forum and photo galleries, but you have to. February 17, 2017. 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. 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 … '80 CB750 Charging Issues. REAR SUSPENSION.. It is over charging and buring out all bulbs. 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. Honda CB750K 1981, Alternator Rotor by Rick's Motorsport Electrics®. Starting & Charging Gaskets... Fuse Blocks. … the battery is brand new. 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. 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.) Tried key right away, opened up. Last call for air cooling. Specifications. Honda CB750, CB900, and CB1100 - CLASSICS REMEMBERED. Im getting good tests from the stator which is an aftermarket stator. Rebuilt alternator/charging style rotors for street bikes. Otherwise I'd look at replacing the battery. 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 Yeah, the key worked too. A loose, weak, or dirty connection or key switch can cause improper or erratic charging system output. Doug E. Vintage M/C restorer. im not sure of my test results. Try reducing the spark plug gap to .025 in. The destination is just to get gas! my subreddits. I have an 1980 CB900C that is not charging the battery. Many charging problems on old motorcycles can be traced to dirty, corroded, or burnt connections or the key switch. So I thought if it was so easy, just try the key. Hello everyone. Save Share. I bought a 1981 CB750 last fall. There will be some fundamental explanations throughout this blog, so if your in a hurry to get straight to the testing. 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. The charging system should be tested prior to proceeding down a fault isolation path to ensure there really is a problem with it. We must find the leak. Discussion Starter • #1 • Aug 15, 2010. CHARGING SYSTEM STARTING SYSTEM BATTERY. If I remember right, TOOLS has bought their stuff and it has worked fine for him. The old... jump to content. It started up on two cylinders and another loud BANG and now I … read more. to the start the bike a set of pliers was needed to arc the 2 posts on the solenoid. It's my first bike, and I've always loved it, but I'm having a few issues. I should be able to just use the new key in the tank slot? Any idea how hard it is to replace? Latest. Hey Facebook people... We've created a group for CB750.com members to connect. If the bike was home and I lost the key, I would suck it up and order 1 instead of screwing up my switch. Honda CB750 Owner's Manual 90 pages. Battery charging problems sometimes arise. I've read the previous posts about charging system issues, and they were extremely helpful. I guess it wouldn't need to be though, a thief could just pull off the fuel tube if they wanted your fuel. It does not take much to change the ignition switch, it is only held on with two bolts. Also, any advice on the regulator/rectifier combo that I found online? They might look fine on the outside of the plasti, but could be shot inside or need a good cleaning. Honda CB750K … If your alternator output voltage is low, you'll get less voltage out of the ignition coils. 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. 83. Motorcycle Forum. Pull Starters. Rectifiers & Regulators. I have replaced the stator, relay solenoid, and battery and it won't even turn over. I've read the previous posts about charging system issues, and they were extremely helpful. 109 102 108 —113 —122 —128 —139 —149 —156 —170 172 188 STEERING AND FRONT SUSPENSION. Reviews. Not all charging system problems are due to lack of charge. Honda CB 1000 -- 1983. 81. Headlight Bulb Replacement Procedure. That is true. high beam on. Enter any question, comment or answer about this motorcycle. Everything ohms ok but no charge. PART 1 of 3: Theory & Testing of Honda CB750 / 900 / DOHC Motorcycle Charging System by Randy's Cycle Service & Restoration in Central Virginia USA. I've also taken every connection I can find and re-cleaned all terminals.. the bike charges better cold … electrical problems. 1 - 9 of 9 Posts. 71—82 83—92 . I have a 1981 Honda NX50M with a charging problem. '80 cb750k Charging system troubles So, the new bike isn't charging. My dad gave me his 1981 Honda CB750K this year after buying a Harley. Honda CB 750 Limited -- 1979. 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. Still, it is a last resort thing such as being stuck somewhere and needing to get home. 84. Could RPM in addition to heat be a cause for early failure? By Kevin Cameron. 92 Posts . It had starting issues at the time. I just found the sight and I was wondering if I could get some advice. That is, there is a leak in the system. A melted plug is also a sign of a loose or dirty connector. Honda Nighthawk CB 750 1991 Service Manual 199 pages. A general test of the sytem is coming out proper. There is a table in the service manual to check the actual charging output of the system using these two readings. Make sure you are checking all the connectors too. Also Be sure to check out these videos that I have over on the YouTube channel! Kickstarters. popular-all-random-users | AskReddit-news-funny-pics-aww-worldnews-gaming-todayilearned-tifu-Jokes-Showerthoughts-movies-gifs-mildlyinteresting-videos-science-nottheonion -personalfinance-OldSchoolCool-photoshopbattles-explainlikeimfive-IAmA-Music … Changed the rotor and then died again after one year. edit subscriptions. Yea, the gas tank lock is not very high tec. 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. This will still give you a good idea if you have a problem or not. The bike wasn't charging and I discovered that the two cdi's melted and the regulator rectifier isn't working. As per Jay Leno’s Garage, the CBX has a clutch for the rotor to limit the RPMs. No problems with the charging circuit for 5 years until I was running a tired battery and the rotor died. Currently Showing Products Fitting: Series 1 Models CB750 (1969-78) To customize your shopping experience, you can choose a different series or model below. 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 have a 1979 CB750. Held on with two bolts 's melted and the regulator thread Starter GroupBEnthusiast ; start date 3... 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