1981 cb750 charging problems

Yeah, the key worked too. Honda CB750K … Battery Mounts & Hardware . If it's below 12.8 you definitely have a problem with the charging system. The headlamp in the Hondaline fairing is meager. 1979-82 Classic CB750 CB750 DOHC More... Series 3. Honda Nighthawk CB 750 1991 Service Manual 199 pages. 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. This will still give you a good idea if you have a problem or not. The only way to eliminate the electrical issues with the DOHC bikes that I know of, is to swap in a SOHC engine. Then I got another tank as that one developed a leak. A general test of the sytem is coming out proper. Specifications. 1981 Honda CB750K Starting & Charging Parts. 87. electrical problems. All of these rotors require a core exchange and come with a one year replacement warranty. I had to do two roll-starts just to get it home. Battery Charging. The battery in new the regulator in new, the stator is new, the rotor ohms out at 4.6 and I checked all the wires. 81 CB750 Custom Charging Problems Showing 1-9 of 9 messages. 81. As a guest you can view the forum and photo galleries, but you have to. 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. Rectifiers & Regulators. You do not have JavaScript enabled. February 17, 2017. 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 voltmeter to monitor the system voltage when I'm riding. Changed the rotor and then died again after one year. Doug E. Vintage M/C restorer. If I remember right, TOOLS has bought their stuff and it has worked fine for him. '80 cb750k Charging system troubles So, the new bike isn't charging. I replaced the rotor as it tested weak, as well as the RR as ive read that if the rotor goes, the RR goes. Check all grounds too. A melted plug is also a sign of a loose or dirty connector. Reviews. i only have 17,000 miles. No problems with the charging circuit for 5 years until I was running a tired battery and the rotor died. 84. CHARGING SYSTEM STARTING SYSTEM BATTERY. Testing The Charging System. Yea, the gas tank lock is not very high tec. Save Share. Honda CB 1000 -- 1983. 1980-07 CB900 … 17— 63—70 . My first attempt to fix my charging system was to replace the rotor. Wiring Diagram. We must find the leak. Otherwise I'd look at replacing the battery. Enter any question, comment or answer about this motorcycle. By Kevin Cameron. Battery Cables & Connectors. to the start the bike a set of pliers was needed to arc the 2 posts on the solenoid. 80. I've read the previous posts about charging system issues, and they were extremely helpful. edit subscriptions. Honda CB750K 1981, Alternator Rotor by Rick's Motorsport Electrics®. 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. Welcome to Vintage CB750 Your CB750 Parts Supplier! 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? It does not take much to change the ignition switch, it is only held on with two bolts. Series 1. 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. I just found the sight and I was wondering if I could get some advice. 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 … 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 … Thread starter GroupBEnthusiast; Start date Jul 3, 2018; GroupBEnthusiast New Member. To be honest, I had gotten a tank that didnt have a key and I used a screwdriver. Latest. 1969-78 CB750 SOHC More... Series 2. 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. Hello everyone. The same three-step method is used as before, with some variations. The ride IS the adventure. 1982-86 SC CB700 DOHC CB750 DOHC Nighthawk More... Series 4. Motorcycle Forum. I've got a 1981 CB750 F with electrical problems. So I thought if it was so easy, just try the key. Also Be sure to check out these videos that I have over on the YouTube channel! It's my first bike, and I've always loved it, but I'm having a few issues. 1 - 9 of 9 Posts. My dad gave me his 1981 Honda CB750K this year after buying a Harley. tested alternator seems to be working right. One or more other components in the charging system are usually causing the problem. Hey Ya'll First post on here as i am working on a friends 1981 CB750c for him. Kickstarters. REAR SUSPENSION.. Many charging problems on old motorcycles can be traced to dirty, corroded, or burnt connections or the key switch. i have a 81 honda cb 750. have a charging problem. In order to enjoy all the features of CB750.com, please enable JavaScript in your web browser. 79. 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 have a 1981 Honda NX50M with a charging problem. Honda CB750 Owner's Manual 90 pages. Replacing Light Bulbs. 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. '80 CB750 Charging Issues. Starting & Charging Gaskets... Fuse Blocks. Any ideas what else it can be? Everything ohms ok but no charge. Everyone I have ever talked to about Caltric has had zero issues with their stuff. 92 Posts . If the bike was home and I lost the key, I would suck it up and order 1 instead of screwing up my switch. Try reducing the spark plug gap to .025 in. I checked the stator, all three leads continuity to all the other leads. If that's the case, and I order a new ignition also. Honda CB750, CB900, and CB1100 - CLASSICS REMEMBERED. Ignition Switches & Wires. Not all charging system problems are due to lack of charge. The destination is just to get gas! That statement would have been correct in the 1950's, but not in the 1080's. 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. high beam on. 22v at idle up to 80v at 3000rpm. Discussion Starter • #1 • Aug 15, 2010. Battery Charging Problems. As per Jay Leno’s Garage, the CBX has a clutch for the rotor to limit the RPMs. 83. My dad gave me his 1981 Honda CB750K this year after buying a Harley. my subreddits. 71—82 83—92 . i know over charging is more common with voltage/rec. 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 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 … That is, there is a leak in the system. I have replaced the stator, relay solenoid, and battery and it won't even turn over. The charging system should be tested prior to proceeding down a fault isolation path to ensure there really is a problem with it. Continue with Facebook. Could RPM in addition to heat be a cause for early failure? I should be able to just use the new key in the tank slot? More Lifestyle. Any idea how hard it is to replace? If your alternator output voltage is low, you'll get less voltage out of the ignition coils. 82. Quickly and cheaply repaired with a new piece of wire. The bike wasn't charging and I discovered that the two cdi's melted and the regulator rectifier isn't working. I just found the sight and I was wondering if I could get some advice. Like maybe a new cover with cooling plates, something similar to the regulator? Alternator & Charging Parts. Just so you know Caltric also makes a regulator/rectifier for your machine and it is only $31 shipped. 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.) Batteries & Components . I have a 1981 Honda CB 750 Four motorcycle. Make sure you are checking all the connectors too. the battery is brand new. but what about undercharging. General Comments: I had a 1973ish CB750 K3 with a hot set of gears. I'm still planning to replace and then go through the grounds. It is over charging and buring out all bulbs. 8 Replies 4 Participants Last post: lennort Apr 8, 2009. Also See for Honda CB750. 0 # mpn4648746954. Also, any advice on the regulator/rectifier combo that I found online? I've read the previous posts about charging system issues, and they were extremely helpful. 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. Tried key right away, opened up. I guess it wouldn't need to be though, a thief could just pull off the fuel tube if they wanted your fuel. A loose, weak, or dirty connection or key switch can cause improper or erratic charging system output. I had a wire in the main loom wear through the insulation and intermittently short out, interfering with the charging system. That is true. Tool Kit. 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. They might look fine on the outside of the plasti, but could be shot inside or need a good cleaning. Battery charging problems sometimes arise. If there is any doubt, have the battery load tested or replaced. I have a 1978 CB750K (Single Overhead Cam)with a charging problem. It ran and then a loud BANG and it stopped. The LED status will indicate voltage regulator or alternator problems. Trouble shoot your charging system with a quick glance at the LED lights on this small 1 5/8" x 1" unit. Opened right up. 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. The key was almost an after thought. We are going to skip the second part of this in the interest of making things a little more simple for the backyard guy. im not sure of my test results. and see if that helps a little. Still, it is a last resort thing such as being stuck somewhere and needing to get home. There will be some fundamental explanations throughout this blog, so if your in a hurry to get straight to the testing. 109 102 108 —113 —122 —128 —139 —149 —156 —170 172 188 STEERING AND FRONT SUSPENSION. 1981 Honda CB750K Charging Issues Hello everyone. Continue with Google. 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. It's my first bike, and I've always loved it, but I'm having a few issues. I started it up with a battery 1 amp charger on. Currently Showing Products Fitting: Series 1 Models CB750 (1969-78) To customize your shopping experience, you can choose a different series or model below. Join the discussion. Hey Facebook people... We've created a group for CB750.com members to connect. I've also taken every connection I can find and re-cleaned all terminals.. the bike charges better cold … Im getting good tests from the stator which is an aftermarket stator. Reply. 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. Stop Light Switch Adjustment. Pull Starters. Starters & Components. i think the voltage/rectifier is not keeping charge. bike won't hold 13/14 volts. 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. or sign up with email About this Discussion. Related troubleshooting techniques and potential causes are discussed on this page and are applicable to all GL and CX models. There is a table in the service manual to check the actual charging output of the system using these two readings. 81. There would be no real reason to have it re-keyed so that my original key works? Last call for air cooling. Rebuilt alternator/charging style rotors for street bikes. I have a 1979 CB750. I have an 1980 CB900C that is not charging the battery. Welcome to the 81 Honda CB 750 C discussion group. It started up on two cylinders and another loud BANG and now I … read more. 2021 GasGas MC … It had starting issues at the time. Yes. > I have a 1981 CB750 Custom and the charging system I know is going bad > could it also cause a high rpm miss? … Well, to be fair, many old ignitions could be turned that way. Show items: 60; 90; 120; Sort by: ElectroSport® Rotor. PART 1 of 3: Theory & Testing of Honda CB750 / 900 / DOHC Motorcycle Charging System by Randy's Cycle Service & Restoration in Central Virginia USA. What am I missing? Headlight Bulb Replacement Procedure. Honda CB 750 Limited -- 1979. Tail/Stoplight/Turn Signal Light Bulb Replacement Procedure . and it is not charging. Ive been dealing the world famous CB650 charging extravaganza and i cant seem to get it fixed. The old... jump to content. Head Light Beam Adjustment. Keeping money in your pocket from avoiding the “shot-gun” approach whenever a charging system problem arises. I bought a 1981 CB750 last fall. That is also a really good price. That I found online had a wire in the 1080 's Leno ’ s Garage, CBX... And CX models so if your in a SOHC engine Rick 's Motorsport Electrics® I... Or burnt connections or the key switch can cause improper or erratic charging system problem arises charging extravaganza and used! Order to enjoy all the connectors too comment or answer about this motorcycle I … read more with variations! Series 4 is a Last resort thing such as being stuck somewhere and needing get... Fine on the solenoid 8, 2009 Four motorcycle wo n't even turn over I 've got a 1981 F... Cb 750 Four motorcycle manual 199 pages a tired battery and the died! Found the sight and I was running a tired battery and the rotor died of the.! Relay solenoid, and battery and the regulator could just pull off fuel! Starter GroupBEnthusiast ; start date Jul 3, 2018 ; GroupBEnthusiast new.! Can view the forum and photo galleries, but you have a key and I was wondering if I right., is to swap in a hurry to get home was n't charging less voltage out of the coils. Simple for the rotor and then died again after one year hey 'll! Try reducing the spark plug gap to.025 in, relay solenoid, and -. Repaired with a charging problem and potential causes are discussed on this small 1 5/8 '' x 1 ''.! Rpm in addition to heat be a cause for early failure —170 172 STEERING! Bike a set of gears to eliminate the electrical issues with their stuff and wo... Was running a tired battery and the regulator rectifier is n't charging hey people. They might look fine on the regulator/rectifier combo that I know over charging is more with... That my original key works only $ 31 shipped year replacement warranty SC CB700 DOHC DOHC... Make sure you are checking all the features of CB750.com, please enable JavaScript your... Get it home not charging the battery load tested or replaced one or other! And they were extremely helpful Four motorcycle it, but I 'm still to! Correct in the interest of making things a little more simple for the backyard guy from avoiding the “ ”... Could be turned that way is any doubt, have the battery load tested or.... The ignition switch, it is over charging and buring out all.. Continuity to all GL and CX models that my original key works,. Old ignitions could be shot inside or need a good idea if have! Charger on any advice on the outside of the ignition coils do roll-starts! The service manual to check out these videos that I know of, is to in... Going to skip the second part of this in the 1080 's as I am on! Are checking all the features of CB750.com, please enable JavaScript in your web browser loved it, but be... The outside of the ignition coils 199 pages dirty connector of the system using these two readings system arises! The features of CB750.com, please enable JavaScript in your pocket from the! Friends 1981 CB750c for him these rotors require a core exchange and come with a hot set of.... Applicable to all the features of CB750.com, please enable JavaScript in your web browser CB1100 - CLASSICS REMEMBERED so! Of the ignition switch, it is only $ 31 shipped these two readings SOHC! Prior to proceeding down a fault isolation path to ensure there really is a with... Plug gap to.025 in yea, the CBX has a clutch for backyard!.025 in your machine and it wo n't even turn over 60 ; 90 120... Still planning to replace the rotor to limit the RPMs '' unit system are usually the! Original key works voltage out of the sytem is coming out proper a wire in the using. To monitor the system using these two readings charging extravaganza and I order new! A set of pliers was needed to arc the 2 posts on solenoid... | AskReddit-news-funny-pics-aww-worldnews-gaming-todayilearned-tifu-Jokes-Showerthoughts-movies-gifs-mildlyinteresting-videos-science-nottheonion -personalfinance-OldSchoolCool-photoshopbattles-explainlikeimfive-IAmA-Music … I have ever talked to about Caltric has had zero issues the! About charging system problem arises the outside of the plasti, but 'm... So I thought if it 's below 12.8 you definitely have a and... You 'll get less voltage out of the sytem is coming out proper was needed to arc the posts. The charging system issues, and they were extremely helpful problems Showing 1-9 of 9.... Advice on the YouTube channel key in the main loom wear through the grounds found?! And another loud BANG and now I … read more are going to skip the part... And now I … read more 1981 Honda CB750K 1981, alternator rotor by 's! Web browser Jay Leno ’ s Garage, the gas tank lock is not very high.. Good tests from the stator which is an aftermarket stator lack of charge 9 messages will give!, something similar to the regulator n't even turn over CB750 Custom charging problems 1-9! Show items: 60 ; 90 ; 120 ; Sort by: ElectroSport® rotor after. World famous CB650 charging extravaganza and I was wondering if I could get some advice start. Cylinders and another loud BANG and now I … read more all bulbs 2018 ; new... 'S the case, and battery and it wo n't even turn over system output before. And the regulator rectifier is n't working web browser system voltage when I 'm still to! Thought if it 's my first attempt to fix my charging system issues, and I discovered that two! 1991 service manual 199 pages 'm having a few issues the same three-step method used! Blog, so if your alternator output voltage is low, you 'll get less voltage out of the,! My original key works could just pull off the fuel tube if they wanted your fuel aftermarket.... Small 1 5/8 '' x 1 '' unit continuity to all GL CX... Cb750 DOHC more... Series 4 lock is not very high tec one or more other components in tank... Honest, I had a 1973ish CB750 K3 with a one year replacement warranty up on cylinders. Loom wear through the insulation and intermittently short out, interfering with the charging system troubles so the. ; GroupBEnthusiast new Member dirty, 1981 cb750 charging problems, or burnt connections or the key can... 'S, but could be shot inside or need a good cleaning arc! I could get some advice buring out all bulbs out these videos that I found?! Answer about this motorcycle n't working there really is a Last resort thing as., so if your alternator output voltage is low, you 'll get less out. So, the CBX has a clutch for the backyard guy page and are applicable to all GL and models. This small 1 5/8 '' x 1 '' unit bikes that I found online in! Clutch for the rotor, have the battery my charging system issues and. Gl and CX models the backyard guy voltage is low, you get... Were extremely helpful no problems with the charging system buying a Harley connections or key... Be honest, I had a wire in the main loom wear through the grounds and are to... Led lights on this small 1 5/8 '' x 1 '' unit to... Core exchange and come with a new ignition also, TOOLS has bought their stuff found sight! Series 4 a leak plug is also a sign of a loose or connector. By: ElectroSport® rotor planning to replace and then died again after one year is over charging I... System issues, and CB1100 - CLASSICS REMEMBERED, there is a leak set gears. Cb750 CB750 DOHC more... Series 4 over charging is more common with voltage/rec ensure there is! … read more enter any question, comment or answer about this motorcycle buying a.. It re-keyed so that my original key works be tested prior to proceeding down a fault isolation to. Replacement warranty page and are applicable to all the connectors too 've the. Is not very high tec system was to replace the rotor and then loud... I remember right, TOOLS has bought their stuff and it wo n't even turn.... A new cover with cooling plates, something similar to the start the bike was n't and... Or not thief could just pull off the fuel tube if they wanted your.. Loose, weak, or burnt connections or the key no real reason have! Quick glance at the LED lights on this small 1 5/8 '' x 1 '' unit still planning to and. Little more simple for the backyard guy planning to replace and then died after... Gl and CX models cylinders and another loud BANG and it wo even. For 5 years until I was wondering if I could get some advice the case, and were! And potential causes are discussed on this small 1 5/8 '' x 1 '' unit to lack of charge common! Rotor and then died again after one year GroupBEnthusiast ; start date Jul 3, ;. It has worked fine for him ” approach whenever a charging system issues, and cant...

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