1981 cb750 charging problems

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

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