engine

I bought an engine from a guy and dont know exactly how to tell by the numbers on it. CB750-2436023

Hi,I'm cbxjon3 .I have a 1998 nighthawk,could anyone tell how to get lower case to come apart.,,thanks jon

When i rebuilt my CB750KZ last year i used new piston rings but i didnt deglaze the bores (yes i know!). Engine is out now and cylinders ready to hone. The question i have is even though the engine has only been run for a few minutes (no more than 5 mins) since the last rebuild will i need to...

I'm new to the Honda CB750 family. I just got my first one. The guy tells me that I got it from that the kickstarter is just stuck. And when I try to turn over the motor manually by hand with a wrench the nut just spins. Almost like it's stripped. Is the kickstarter broken or is my entire engine...

Dear People: I have tow measures of Dowell Pins in the Camshafts . 23 are 8*20.5 and only 1 different 8*26: I do not find clear where this one is located. I investigate carefully the manual and the Clymer Book and I am not sure. I would appreciate some help. Best Regards

Thoughts. Thinking about giving cyclex a stack if money. Send them a 78 lower end 73 cylinder and head. They send me back a complete mill sporting 970ccs 12.5:1 comp. Running hard weld rockers beehive springs .4 lift cam 263 deg duration. Enlarged intake ports with 34mm carbs. I hardly see...

I'm reinstalling my cams, with the crank at 1.4 - T and my exhaust cam installed with the #1 cylinder lobes pointed towards the spark plugs, I can see the sprocket punch marks above the head, but they don't align perfectly. They're probably closer to parallel with the floor than parallel with...

Hi everyone, I just purchased this CBX750F 1984 model here in Australia; compliance plate/frame number (RC17-2005966) 3/1984. I have a few questions for those experienced CBX750/CB750 DOHC owners. The guy I bought this bike from said it was running 10 years ago had a recent top end rebuild then...

Hi, I am new to automotive work I am 21 years old and bought a 1980 Honda CB750k it runs and hits top gear. there are a few issues with it, 1.) Gas slowly leaks from carb it drips slowly. 2.) the engine seems to be smoking while running it when it gets hotter and sits still, maybe just the gas...

Hey everyone! Newbie here! Read every thread I could find on exhausts for my bike and I see a lot of discussion regarding swapping different years but nothing on my question... Just picked up an 80’ 750c at auction with 3k original miles...it was a steal and I am very excited! Carbs are a mess...

I've tested the compressions on my CB750KZ as its been difficult to start and I get 125-100-105-130. Putting a squirt of oil in the bores didnt make much difference but that maybe cos its been stored for a few months and i did put some oil in before storage. I did put new rings in when i rebuilt...

Hello, first post here. Last week I picked up a 1980 cb750. Just got it running and it has a knocking sound at idle that goes away with any revs at all. I was thinking cam chain but then by advice on a fourm I put it in gear (on the centre stand) then I put the brakes on and released the clutch...

Hello fellow cb750 owners just bought a 1979 cb750 dohc in November and I already took it all apart for a restoration/cafe racer build. I’m in the search for a new piston replacement since piston number two is pitted from my guess a piece of a spark plug. I noticed there is different size such...

Hi - I just picked up a 1980 Custom - I'm pretty sure the plugs are original as the mileage is only 5k. What brand/spec are you guys liking for this? I looked up the originals (DEA9 or something) and not available anymore. And of course, I'll do an oil change - any tips on oil for this machine...

I've recently started a rebuild/restoration project on a 1980 Honda CB750C. This is my first project ever so still pretty new to everything. While taking off the crank case, it seems to be stuck at a point around the stator rotor. The rest of the crank case can be lifted upward just fine, but...

I have an issue with my bike smoking after sitting for a few days. If I don't ride my bike for about 4 days when I go to crank it up the exhaust will smoke for a good 3 min or so until the bike is warmed up. (Its a gray smoke not black.) However if I ride it back to back days I don't have this...

I've been off this site for years now but am finally at the last stages of my CB750 rebuild. The bike was a complete basket case I inherited from a dead friend. It was originally a 1970 but is anything but numbers matching - I just want a good rider. I've built quite a few bikes in my life...

Afternoon, so I took your advise and swapped out my k&n air filter with a stock paper filter and in doing so the k&n reeks of fuel. I ended up pulling the carbs and noted that the intake boots had a little moisture in them. Air box "appears" dry. I plan on doing a "basic" carb rebuild...

I was thinking about winterizing and read in the Clymer manual about some Engine Cylinder Protectors that screw into the spark plug holes. A Google search didn't turn up anything like that. Clymer book refers to the Brookston Co. in Peterborough NH. Could that be a typo and they meant...

1978 CB750K. I have an oil leak from behind the Advance unit. It looks like there is only a 6 X 2.3 O-ring behind there on the Spark Advancer Shaft. It looks like it may be easy to change? Any cautions I should know about or pointers? Thanks

I've been trying to chase down a problem with my 1978 Hondamatic 750A running very poorly in cold weather, in the 40's or 50's F degrees. It runs great in the summer, but predictably runs terrible when it cools off in the fall. I completely gone through the carbs, with no change in the...

So will exhaust from a 1980 Honda CB 750 C fit a 1981 Honda CB 750 K,.?

Will exhaust from a 1980 CB 750 C fit on a 81 750 K ?

I have a complete set (4) of HMCB750HM405 off a 1977 CB750K in excellent condition wondering what they are worth?

Hi all, I've got an 82 CB750 that I picked up over a year ago not running and have been slowly rebuilding and converting to a cafe racer. The project is around 85% complete and have had a few attempts at getting the engine to run properly with not a lot of success. I'll start with a bit of...

Hello members.. I have a quick question.. after much perusing regarding 750k pistons.. I need to know if any year sohc K piston will work in the 1978 cb750 k... reason I ask, is that 77-78 pistons are very hard to come by and my options economically point me to the earlier reproduction...

Hey all, new guy here looking for some help. I'm new here and new to motorcycles and vehicle maintenance in general, so apologies in advance as I learn. I bought a 1978 CB750 Super Sport and looking to learn and grow as I work on this baby to hopefully bring her to her former glory. I've started...

Bike: 1980 CB750F Supersport. I'm installing a new camshaft which is much higher lobed than the stock camshafts (Webcam Grind #110, part 55-491). I'm new to this precision measurement stuff, but here's what i have; Valve lift: .395" (10.03mm) on both Exhaust and Intake. Starting at 20 degrees...

Hello everyone, Looks like this is the site for all things CB750 related. Yes, I'm the newb, and will post a picture of my bike soon :) So, I just got back into riding after a long hiatus, and picked up a 1980 CB750C with (supposedly) 7000 miles. The bike is in decent shape, not like new...

Thanks to all you wonderful people on this forum I've finally rebuilt my engine. I was super methodical to ensure I didn't make any more mistakes upon reassembly. Now that it's all together there are a couple issues I'd like your help addressing. First, the camshaft sprocket marks refused to...