So, I bought a 1980 CB750F new in 1980, I still have it but it sat for many years, about a year ago I decided to completely disassemble and rebuild. Frame was power coated then got distracted so now I ready to go through the engine but not really sure where to start, the cases are split, it has about 40,000 miles on it, what should I replace and I find that several parts are not available, I’ve rebuilt a few twin top ends but I’ve never gone this far into a four cylinder . Any help would be greatly appreciated.
Somewhat of a nube
- Thread starter 80hondaf
- Start date
81cb750f
CB750 Member
Wow, you've had yours longer than me. I bought mine in 86 and still have it.
Does the engine need much rebuilding? 40,000 miles isn't much but I guess there is a lot of corrosion?
I would think the bottom end should be fine as well as cam chains and sprockets. For the rest, pistons, rings, camshafts, I guess it just depends on how corroded things are and whether you can polish them to decent condition.
Main thing is carbs. They would need a complete breakdown and cleaning. MacGregor has an excellent how to manual: https://www.cb750c.com/publicdocs/SeanG/Honda_Carb_Manual_revG.pdf
Also, I found CMSNL has a lot of parts https://www.cmsnl.com/
Good luck!
Does the engine need much rebuilding? 40,000 miles isn't much but I guess there is a lot of corrosion?
I would think the bottom end should be fine as well as cam chains and sprockets. For the rest, pistons, rings, camshafts, I guess it just depends on how corroded things are and whether you can polish them to decent condition.
Main thing is carbs. They would need a complete breakdown and cleaning. MacGregor has an excellent how to manual: https://www.cb750c.com/publicdocs/SeanG/Honda_Carb_Manual_revG.pdf
Also, I found CMSNL has a lot of parts https://www.cmsnl.com/
Good luck!
My main concern is with the cam chain guides and primary chain guides, I don’t know if anyone has ever had an issue with them as far as coming apart meaning the metal and nylon or whatever it is.
81cb750f
CB750 Member
yes, good point, agree, cam chain guides and tensioners likely need replacing. I just replaced mine actually. When they are old, cracks appear.
