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I received a 1978 CB750K from a good friend of mine. It had sat for 19 years. 12K miles, looks like brand new. I got everything OK, except the idle circuits. It was HARD to start and would not idle for anything. So, I removed the fuel line from the tank petcock, drained the float bowls then...

I am now getting ready to do the throttle drop procedure on my 1980 k model. Cant get a steady idle. Using the idle adjusting screw I can get it down to a fairly low rpm, and I think "that doesn't sound to bad" and then in about a min. or two, it starts surging up to over 3-4 k rpm. I adjust the...

Im a new owner of a 82 750 super sport im waiting on a service manual and want to remove the seat . I cant figure it out whats the trick do i have to remove the luggage bags and trunk also?

: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...

Hey Guys! My good friend and I are taking on the DOHC CB750 build. Our plan is a full rebuild, restoration, cafe to the nth degree of detail. We don't know a lot but are learning a ton as we go. If you would like to follow along and help us out our channel is below. We are much further than our...

I'm at the end of my rope here, I have had the carbs off 5 times now, apart back together, apart, back together. I've cleaned them ultrasonically for about 5 hours... blew everything out put them back together and back on and the problem persists. My buddy keeps telling me it's dirt in the...

Hi guys, Just joined. I purchased an 82' nighthawk 750 that's been sitting for years and needs carburetor love. The bike arrives in two days but I thought I'd get a jump on things and get the service manual. I just purchased a manual from emanuals.com and it's supposed to cover the years...

Hi all, I have just swapped the handlebars on my 79 Cb750fz from the higher US bars to the Europe spec lower bars. My throttle cables are now too long and no matter how I route them they sometimes stick when operating the throttle. Which models throttle cables would fit to fix this problem, ie...

Hi there, I am working on restoring my first bike and had a quick question about seat compatibility. I have a 1979 CB750L, but the seat that came with is is torn, worn and base is rusted out. I just got a decent offer on a 1980 CB750C seat and I was wondering what the chances were of making this...

Hi, I just removed my carburetors and plan to spray paint them with etch primer, nason urethane primer, then nason ful-base-IR basecoat, then clear coat. Best way to clean the gunk off of them? Not sure if I should use methyl ethyl ketone (MEK), the Klean Strip MEK substitute I can get at my...

Hello, Do I actually have to remove the cam chain tensioner in order to remove the starter motor. If yes, why? Thanks!!

Howdy, I have a new harness and I'm trying to figure out how to connect the solenoid. I do not have one currently on the bike, so i'm replacing the whole solenoid. But, there are two nodes that need to be connected to something. Here are my questions This photo shows the connector...

Am very naive to working on my bike, learning as I can. Started my 1991 Nighthawk 750 after sitting over winter and a fairly good flow of oil was pooling on garage floor. Tracked it to coming from Stator cover on left side. Removed 3 bolts and cover. Started again and oil was oozing quite...

Hello, I am trying to figure out an easy way to get my 1976 CB750 running. I have a new harness, but I don't want to replace it until I know I cannot start the bike without replacing it. So, what are some steps I can take to figure out why my bike isn't starting, or steps to get it running...

Hey All! Happy to join the ranks of happy CB750 owners. There are a few questions I have regarding my newly acquired cb750. Hopefully you will be able to see the pictures attached. First: Is that front rotor too rusted? it isn't pitted at all, pretty smooth.. the rust seems to rub off...

Hello! New to this forum. I have a 1982 cb750 that I've picked up over the winter and done some work on, but my friend recently lost my only key :mad: I'm hoping to get some help/advice/walkthrough on installing a simple toggle switch to bypass the ignition switch so that I can still use my bike...

Hi All, I bought a '79 cb750 last year and was able to get it running. However, I am having a lot of issues and I dont really know where to begin. My biggest issue that I am trying to solve for the moment appears to be a problem with the carburetors. Currently the bike does not start unless...

Hi all, newbie to the site here. I've had my Nighthawk 1991 for 10 years now and love it but it's recently stopped charging so I'm on the hunt for the cause. But, for the life of me I cannot find the reg/rec on this bike! I feel like I'm going mad. Can anyone tell me where it should be please...

Hello everyone, biking season starts in about ten days here in Denmark and my CB Seven Fifty (1997) street tracker build is nearing completion. One of the last things to do is wire in my new Acewell MD52 speedo and tach but I am having difficulty finding a properly high res wiring diagram from...

Hi and greetings from snowy Finland! I'm totally new with bike electronics, so I would appreciate very much, if someone with knowledge could comment my wiring schema. Biggest unsure is with how to connect reg/rec, spark units and coils with M-unit. I would like to have it so, that electronics...

Greetings, my first post on this forum. I haven't worked on a Honda for many years but my son bought one and he needs my help. We rebuilt the front caliper and master. We followed shop manual procedures. I also watched a couple YouTube videos to check my work. When assembled the master...

I have inherited a '78 CB750K, and have just completed a bunch of work to get the bike to the point where it *starts*, which is encouraging. But, several of the carbs are leaking through the overflow tubes. I've taken the carbs apart a four or five times, cleaned them as best as I could, but...

Hello, I recently got my first CB750 (1981 Cb750F) and the head light is in rough shape. I want to go for a more aggressive(military style) look, but I am also new to building bikes! I would love some help figuring out how I can replace/modify the OEM headlight(and all those ridiculous wires in...

I'm currently building an 83 Nighthawk Cafe but want to get it running before fabbing. I checked spark, compression and gas before trying to start it and was able to get it to run for about 10 sec. I did some cleaning to the carbs cause I knew the floats were getting stuck. Cleaned the carbs put...

N00b here when it comes to brakes. I have a caliper that seems to misbehave after braking once or twice - piston gets jammed, have to wait until it slowly goes back in. I figured a rebuild would be a good idea after asking around and would be interesting. Long story short, master cylinder is...

So I need to get my 79 cb750k safetied. Looks like I just need to put my chain guard back on and put on DOT approved signals. POSSIBLY fenders, depending on how strict the guy is. If its just the signals.. where should I go to get the cheapest DOT approved signals? Ive been looking around but...

Hey Everyone, I'm new here and was hoping I could get some opinions. I have a 79 CB with a 4 into 2 exhaust. I was thinking about cutting the mufflers in half and purchasing one of those after market baffles. The headers are perfect but the mufflers were spray painted black so I dont mind...

Good morning, my 750 motor with a socket on the crank moves about 6 inches oneway then sounds like it hits the block and stops. then I can take it back the other way and about 6 inches it sounds like it hit the block again and stops again. what could cause that?

Just sharing.... Awhile back I read a comment about fixing cracked side covers with JB Weld. Well, it works great. I actually used some industrial lock weld but I think they are all about the same, just different brand names. 2 part compounds that are meant to get hard enough to drill and tap...

Just a quick intro. New to the CB750 but not new to motor cycles. I mostly work on them now rather than ride. My age is showing. This year I have rescued 2 old relics and turned them into useful bikes. A 50cc Chinese monkey bike for my younger grand son and a CB400T II for my older grandson...