electrical

I needed 4 shoulder screws for my 81 Honda CB 750 K,.For the turn signals to mount on the stays,., Found them at a dealer in Pa. I installed turn signal and when I screwed the the screw down through turn signal course it bottoms out,. But turn signal is still loose .Any answers here...

I am trying to work out some issues with my electrical system. I downloaded a manual from this site but the full schematic at the end of the electrical section is not legible. you can see the lines good enough, but you cant read any of the text. so you cant see any connector names, or wire...

1980 cb750k, where is the silicone rectifier located? is this part of the voltage regulator or a separate component? manual page 16-2, speaks of it as if its a separate component.

rotor coil on 1980 cb750k: left or right hand thread on rotor bolt?

Discovered today that my battery is not charging, I have a manual, and haven't started going thru the list yet, was wondering if anybody had any advice on what to start with first? I was thinking maybe the brushes on the stater coil? thanks for any advice

Hi I’m new to this forum but I have read several of your posts. Well here’s my problem. I have a 1974 cb750K that I have been battling black spark plugs only in number 2&3 cylinders ever sense I bought the bike two years ago. The plugs are black and sooty with no wetness and no smell of fuel...

Hi my turn signal indicator lights are always on even with no turn signals hooked up. When I actually do engage the turn signal switch it will switch off the correct side indicator light. When I do have bulbs hooked up only the rear turn on and the front are always off with the switch not...

Hi I replaced all of the original blinkers with led ones (led strip light in the rear, and bar mount led in the front) on my 81 cb750 c. As soon as I hit the turn signal switch the turn signals just start to flash when the main (turn signal/brake light) fuse blows. Does this sound more like a...

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Hey Everyone, I swapped out my wiring harness today for a new one from vintagecb750.com While doing this I noticed that there was an additional wire running from the rear brown connector all the way up to the headlight and plugged into the black that would normally power the signal buzzer (its...

I have an 81 CB 750C, and am the original and only owner. My issue now is that the headlight will not come on when turning the ignition on. This has happened before, and recently when starting the bike, after sitting all winter, the light came on after it was running about 10 minutes. The next...

HI Team, Im loooking for some replacement pickup coils for a 1981 cb900f. They have the same part number as the pickup coils found on the cb750f. #30300461405 Does anyone know of a part to replace with, or a new ignition system that I could throw on? I didnt want to go as far as the dyna 2000...

Hello, im wondering if anyone can help me source the issue on my bike so randomly the bike would start backfiring under acceleration between 3-4000 RPM. installed new iridium plugs and it was fixed no more backfiring or sputtering. it never ran so good in its life!! Than... day in a half later...

I've got an 2003 CB750SC that I bought new in 2004. It's got 64,000 trouble free miles and I've been riding it almost daily since new. I've owned many bikes and have been riding continuously since 1969 and am pretty familiar with motorcycle mechanics in general. I've done all service...

Ladies and Gents, I just restored a 1980 CB750K and she was running fine. She was sitting in the driveway idling and I pulled the brake lever and all power shut off. No lights on the display, no headlight. Like the main fuse had blown. So I checked the main fuse and the fuses in the headset...

On a ride and turned off bike with key. 5 minutes later, turn key back on and everything was dead. Replaced main fuse and was able to kick start engine and everything electrical seems to be working except the headlight and starter. HELP 1975 CB750 super sport Mike

78 cb750. The speedometer and tachometer lights will not come on. Running lights will come on in park but not run. There is continuity between all the wires. Meters have 12v at connector in headlight bucket but not at ignition switch. The top fuse that controls all of these lights does not have...

Hi guys, I'm trying to decide upon a battery for my CB750 DOHC project. The following is a comparison of the options I've come up with. I know the Shorai is a "safe bet" - I see loads of people using these. Just wondering what your thoughts were on the LTM14BL or YTX14AH-FP units. They're...

:banghead: I have a basically stock '79 DOHC 750 except a Dynojet kit. whats going on is my bike a really modified visually and I've eliminated nearly all stock parts... ie, lights, gauges, ect... I have all new OEM harnesses throughout, new controls on the bars, a Reg/Rec from Oregon cycles, a...

I bought this bike a few weeks ago and now have her running. She runs on cylinders 1-2-3 but cylinder 4 doesn’t run. I found this out by checking the exhaust on the 4th cylinder and I can rest my hand on it forever without burning it. So I removed the spark plug to see if I had spark. It sparks...

I recently bought a 1981 CB750k I changed the handlebars , grips bushings , spark plugs and fork oil. The recent owner told me the bike had a charging issue so when I got it I tested everything (battery, rotor, bushings, regulator rectifier). The bushings were bad so I ordered some and now I...

Hi there. New here and very excited to get my CB back up and running! I have a ‘81 CB750F, all original excluding aftermarket exhaust (4 into 1). Before any work, it ran...not amazing...but it ran. Carbs needed to be cleaned, boots were cracked and were leaking air badly, exhaust was all...

Hi - first post. Picked up a very low mileage '82 CB750. Have a few issues I could use some advice on as I try to get this road worthy. Turn signals light up (running lights on front), but don't flash (they turn off when turn signal is activated). There is a fat round solenoid mounted next to...

Hi - first post. Picked up a very low mileage '82 CB750. Have a few issues I could use some advice on as I try to get this road worthy. Turn signals light up (running lights on front), but don't flash (they turn off when turn signal is activated). There is a fat round solenoid mounted next to...

I have 1974 CB750 Honda custom chopper, I picked up second hand. There was no wiring harness, it has bare minimum wiring. the rectifier, the voltage regulator and the starter solenoid is all located in a hand made control box. Its all ran thru toggle switch and a push button start with no key...

I am looking for a Headlight for a 81 Honda CB 750 K,.

I put a K6 motor in a K3 frame (and K3 wire harness). The ignition switch is a three position switch (off, start, start with lights). I replaced the old point ignition system with an electronic ignition and used power from the brakes wire to power the electronic ignition. It runs well in the...

Hello all, I have tried searching this issue with no luck, building my first bike, '81 CB750K. The person before me removed the front blinkers and putting it together I am going to leave them off. However, i cant get the rear blinkers to work. I have brake lights, and running lights. I think...

Hi! My ignition coil made a poff noice and started to smoke and melt about 30sec after startup. Background info: I have run my bike without the regulator. I know, stupid af. I had a rush get it to the vehicle inspection so I left it out. The bike ran great so I forgot about it. Also stupid, I...

I have a cb750K8 and have come to realize that when my coils are mounted in the proper spot and the key is turned on, the main 15 amp fuse blows. If I unbolt the coils from the frame and leave the coils wired up, the fuse does not blow. I know the coils are supposed to ground through the spark...