engine

Hello all, I am new here - I have come across a problem in the rebuilding process of a DOHC CB750 and I don't know where else to go! A little background about the bike: 1979 CB750K DOHC engine fit into a SOHC frame, mileage is unknown, started to make cam noises (spinning noises) so removed...

Hello, I am working my way through my engine, DOHC, cleaning, checking etc. I have removed the oil pan and needing a new gasket I need to remove the old one. The question is, how? It is stuck fast to the crankcase face. I do not want to use anything that will scratch the mating surfaces, anybody...

If the muffler have a crack in them on the outside does that mean the inside is damaged too? I want to get the crack patched up. It's not in a very noticeable location so it will do until I can get a hold of a new one. Can chrome even be welded?

Does the 80-82 750k/f use a wet sump? Can anyone explain to me when they changed from dry sump to wet sump or vice versa? Im looking at building a cafe racer (82 cb750f) and want to avoid a model with the dry sump/oil reservoir system. Ive pretty much done all the searching i can do, and just...

I've finally gotten my engine torn down and since I'm going to rebuild at 836CC, I decided to go with new rods. Now I'm considering a new crank as well. Looking at the Cycle X race cranks, they list that the balance holes have been welded to reduce turbulence. How much of an issue is this...

to make a long story short, got this awesome nighthawk for a grand. I knew that I would have to do work, it was running when I got it and it ran all summer! then the timing chain snapped... literally snapped, good part was I was in my driveway. I took that bike down to the frame, and completely...

Has anyone had any experience getting a front sprocket that fits a 525 chain? I've been scouring the internet to try and find one but it's proving fairly difficult. I've though about getting a 525 blank from mcmaster carr and paying someone to machine out the 1978 honda splines. Any advice/...

Put a new exhaust on to replace my rotted one. Removed the header and such but cannot get the "flanges" back in to save my life. The crush gaskets are still in there. Is there anything else I can use? Really dislike these things... Thanks!

I have started to tear apart my 1974K . I was missing one of these hollow dowels! Someone was definitely into this engine before but the bike was running for quite some time like this. I thought maybe I dropped it down the cam chain hole but my dad assured me he did not see anything drop. I...

As per honda manual there are markings but can anybody read this? Also these markings only appear on the outer flywheels. All my case letters are B's, all my connecting rod numbers are 2's, and my guess is a 1 A on the crank, B + A = Green. is it possible they are all green ? There was only...

CB750KZ 1980 - I had the infamous spinning starter clutch scenario so I duly replaced the springs etc, threadlocked the 3 bolts and put back together. Now after a couple of normal starts the spinning has started again, could it be the unit where the springs etc are housed could be worn? Has...

About a month ago, I grabbed a 1969 CL125 as a father/daughter side project. We started disassembling the bike last week. I'm stuck on that air filter assembly. It's a long rubber piece going through the frame which comes out behind the engine. On the fw side the carb insert into it, and the air...

Hi, New here. Names Chris. From Northern California, West Sonoma County. I have about 4, K's in different states of needing repair. In the midst of getting the café style one back on the road. It's a 1973 frame, 1970 motor. Pics to come. Pulled the crank bearing during a bottom end tear...

New member here working on a 900 custom and am about to get the stock 4 into 4 pipes rechromed. The chrome shop wants the baffles out, broken down to bare minimum before I bring them to them. My boss, the owner, does not want to change the exhaust style, so while I know that it would be...

I bought a 1977 CB750K about two weeks ago. Couldn't be happier, bike is 100% original with only 12,500 miles. It's been in storage since 1988. I started by removing the carbs, spent the last 2 days cleaning them, they were very dirty and gunked up. Next step was to change the oil and...

I have hit a bit of a stuck point. I'm tearing into my 1981 cb 750. I can't get the cylinders off of the crank case. I have tried everything next to prying it apart. my manual also says to remove a bolt at the front which mine has a nut not a bolt on it and isn't really long enough to get a...

I'm currently looking at a 74 with an engine with over 90,000 miles on it. Current owner says it was rebuilt by the last guy and it looks in pretty good shape and clean. No oil leaks. The only thing I did notice is that it is pretty tough to get into neutral. Any thoughts on the longevity of...

Looking for some help, I need to remove the spark advancer on my 1980 CB750F and was wondering if it is a left hand thread or is it just being really stubborn, I've wrenched on it pretty hard and it's not budging.

Hey guys! I'm in love with the old cb's, and am looking to pick one up on the cheap side to fix up over this winter! Found this girl in town, with a freshly snapped chain, and a nice hole in the case. I've seen plenty of posts by people with "cracked" cases, where people call for a quick weld...

Got a good deal on a engine. So I want to look up the year of the motor, It is a SOHC. Cant find any vin stamped on the motor where I find them on the other cb750 motors we have in the shop. I know where to look as we have 3 other 750s there to look at. Could it be that it may be a case that...

Hello, I am relatively new to CB750's and the whole bike world in general. Two yeas ago I bought a 1979 Honda CB750f super sport, The bike was is decent condition and seem to run fine when I bought it, I have driven it up and down the driveway, But never on the road as I did not have yet have...

So starting to work on my newly purchased CB750 Ltd and I have done the following items. New Spark Plugs Changed Oil and Filter Drained old gas from the tank Installed new inline gas filter and line (Checking compression later this afternoon) With the choke fully out I am able to start the...

Hello There everyone Im new to the forum I'm unsure if I'm posting this in the right section or not a head of time so if i need to make a correction please let me know and i will, otherwise here is my issue Me and my dad are building his 81 cb750 it ran great after cleaning the carbs and basic...

Hey folks, long time lurker first time poster...anyhow to the point... So i bought a rolling chassis with a basket case motor, I fully intended on purchasing a different motor for the bike as this one is in bits, the PO removed the head but did not keep the rocker arms and shafts in any...

Hey all- I have the engine guard shown in the picture on my bike currently, and am looking to replace it with something "cleaner".... specifically I am looking for one that mounts to the (2) bolt points on either side, and DOESN'T have the u-bolt type mount that this one has. Thoughts?

I need to replace one of the 12 longer ones, don't want to buy a whole set. Anyone know of a source for these? 1970 CB750 K0 cylinder head stud bolts.

Just finished a valve clearance check, replaced a few shims and now have 0.005" clearances across the board. Emptied a can of Honda's carb/combustion chamber cleaner into the carb intakes and compression check now looks better - #1 - 140 (130 before) #2 - 150 (same) #3 - 165 (150 before) #4 -...

Hi guys, The rubber grommets on my cylinder head cover bolts are shot (crumbling big time) so I bought some NOS replacements yesterday. I've removed the 4 outside bolts from the cover (not the 4 inside ones yet), but I don't know how to a) remove the 4 inside bolts and b) install all 8 of the...

Just wondering anybody's opinion on new parts vs nos, I know nos is new, well not really new but old and never used. Ok I'm looking to replace some internal engine parts like cam chain tensioners and was wondering which is better, new or nos? Just wondering if time has any effect on these...

Hi Guys, I'm bring my 1980 CB750C from 62mm to 65mm for the Wiseco 823cc piston kit. I'm curious though, what's the most the stock cylinders can be bored out? Will the cylinders become unstable sooner now because I am widening them each by 3mm? thanks!