electrical

So, I've been trying to use a small lithium battery tucked away on my CB750 cafe for a while now. I have not had had any problems with a traditional lead battery but I've ruined a few lithium batteries (2 days ago it melted a Shorai LFX14A2-BS12) and am at a loss. My charging system works well...

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Hey all! This is my first thread I am starting. I would like to say thank you for being such an amazing resource! I just purchased a 1981 honda cb750c. It is fully dressed as of right now and might have a lot of parts for sale in the near future. I would like to get it running first. Ok here is...

Hey Ya'll First post on here as i am working on a friends 1981 CB750c 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. to the start the bike a set of pliers was needed to arc the 2...

Hi all, first post here. I have bought a '71 CB750 basket case that I am "fixing". I have a key that fits the ignition switch and fork lock - it is a Honda key and it looks old enough to be original. The problem is the numbers on the key and ignition switch do not seem to be close to anything...

1981 CB750C DOHC The bike revs fine in neutral but on the road it runs fine until you get to 5k RPM and it dies. I have to get off the throttle and then it is okay. Does this in every gear except neutral. Also once it is warm the bike overall runs terrible at all rpm (maybe because the...

Hello all, new to the forum. On my 1973 CB750F... Bike was running fine, then started running pretty rough after sitting in the shop most of the winter. I put SeaFoam in the tank, didn't clear anything up. Kept running really rough, coughing, spitting, cutting out, mis-firing, etc. We checked...

I just got my 750 Tuesday got it started up and rode it that day and the next day I rode it to work. While I was riding the motorcycle died on me luckily it was in front of my work. myself and a buddy thought it might've been an electrical issue because when I tried starting it again it didn't...

Hi all - I finally got my bike back together and out for a couple of rides, and it's been running great, but on my second outing to work I got trapped downtown needed to ride home in heavy rain. First time rain riding and I made it just fine, but the bike had some issues! It was running great...

Good day gentlemen and gentlewomen, hope now the weather is better you are getting some rubber on the asphalt. I was wondering if any of you know if the electronic ignition from a DOHC will fit the SOHC? The plate the pickup coils are mounted to looks the same size as the plate our...

Hi all, I just picked up a nice 1978 CB750K this weekend. I've had a few bikes, but this is my first Honda 4, and I think it is waaaaaaaay cool. It's bone stock at the moment, and I promise to get some pics up soon. PO said the carbs were cleaned (I don't think so), the plugs replaced...

Okay, my '77 CB750 is all custom (not built by me) and I've had a little electrical fire: As you can see the epicenter is that plastic harness, all damage came from there. I'm wondering if this is a problem with a short where the fire started, or if this is simply a symptom of a different...

Anyone use a different headlight? Mine was removed when i took off the ugly vetter fairing. i found universal ones on ebay but i am worried about the quality. Any other years or from other bikes fit? Directly wire up? If not i'll make a switch and wire it straight to the battery, thanks!

I have a 79 cb750 Limited. I'm replacing both ignition coils (one is faulty), the cables, and upgrading to iridium spark plugs. From NGK D8EA to NGK DR8EIX My question is this: Should I gap these plugs, do I need to? I'm in a toss up. The clymer that came with my bike has specifications for...

Alright guys, I'm new here and excited to get put to work with all your solutions. I recently bought a bike, my first, a 79' CB750L. It needed a carb rebuild, which was a pain. I rebuilt the carb, replaced the air cutoff diaphragms and float bowl gaskets as well as the jets. I'm not sure the new...

Hey everyone! I'm new to the forum and have looked at about every post here trying to figure out how to get my bike going again. When I first picked up the bike it wasn't charging but a quick look at the rat nest under the cafe seat showed some wires undone from the r/r. soldered and connected...

My restoration of a CB750KZ progresses well, however after fitting a new battery i turn the ignition key and the main 30A fuse blows. Obviously a short but everything looks ok to me, i've disconnected all i can, ie left and right handlebar switches, all the lights, starter motor, rectifier etc...

hello everybody just joined Ive just been to look at a very clean original (apart from exhaust muffler) 1977 cb750f1 for sale on eBay on after it had been running for a while it blew the main fuse on looking at fuse box under left side panel it was burnt cover was partly melted didn't look like...

I just acquired my dad's 1982 Nighthawk 750 that he bought brand new when he was 22. It has 12,000km on it and runs great now that a friend has tuned it up. I need a new battery, exhaust, front brakes, caliper rebuilds, tires, and fork seals to get it street-ready. One thing that bugs me about...

Just near end of last season i found the proper gauges for my 1981 CB750 DOHC and welts putting them on i pulled some wire harnesses apart to clean it up in my head lamp a little and when everything went back together didnt quite work the same. So heres the just of it, my turn signals no longer...

Gentlemen, hope all of you are well and ready for better riding weather. I was hoping someone with electrical experience can give me a clue. For another project I picked up some coils which seem to be made by Hitachi, they are marked 12V CM11-53. Curiously they also say "use with external...

I have a 1991 Honda CB750 Nighthawk. I can get the starter relay to click but nothing else. According to my Clymer manual, I checked continuity from ICM plug's green wire to engine ground & got continuity. The next step was to check between the green wire & the black connector for power. There...

Hi guys I'm a proud owner of a 1970 SOHC CB750 engine that I have put onto a rigid frame. :) I am having problems though with the points and want to get rid of them. A friend of mine told me to get the dyna 2000 coils and wires kit. It's 400 bucks, all I can find are ones that are meant for...

Hi All I am new to bikes and to this site (first post) ,I bought a cb750 bobbed in June 79 frame hard tailed with a 82 750f motor . it was setup for suicide clutch and shift , that went first ,reverted back to hand clutch and foot shift , i popped in a new battery and after a little bit of...

Hello all - I am new to the site and looking for some help. I have a 1978 CB750k with a very strange issue. It is firing on cylinders 3 and 4, but won't fire on 1 and 2 (or vice versa). I have coil #1 hooked up to the blue wire from the points and hooked up to spark plugs 1 and 4. I have...

I've been trying to start my K1 for the last week or so, and I can't get it going (No Spark). The last time she started was 1986. So far, I've done the following. 1. Had the carbs rebuilt, 2. Rewired for a new key 3. Cleaned the points, 4. Got a new battery, and installed it. She will turn...

Hey everyone, Here are my issues on my 1972: When the ignition switch is turned on (both engine running or off) and squeeze the hand break, but the taillight does not turn on. When turning on the light switch, the display light in the tachometer, speedometer and the taillight all turn on, but...

The turn signals on my K4 have stopped working. When the switch is engaged, both directions, I get a solid tone from the beeper and the front and rear lamps plus the indicator on the panel do not light up or flash. Does this sound like a component failure (bulbs appear to be ok) or a...

hello everyone i just got my first 1981 cb750 custom yesterday and im still trying to iron all the wrinkles out of her but the biggest problem i have right now is that one of the coils going to the far left cylinder (sorry havent figured out the cylinder order yet ) is staying on constantly...

The previous owner must have toasted the ignition switch and just wraped the wires together and put an on off switch near the battery. 1977 CB750F Super Sport. I have purchased a switch and plan to plug the wires in 1 at a time or find a plug at a parts store that will work. Can some one tell...