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