Edward Buck
CB750 Enthusiast
Hi all, I am in the process of rebuilding two CB750's a K1 and a K4, I split the cases yesterday on the K4 having previously removed the head and barrels. The main bearings look like they have some marks See photo below of worst one, and I'm going to change them having gone this far - the big ends have very little movement in them although there is some. I have no idea how many miles the engine has done. Whats the advice - bite the bullet and change main and big end shells?
Also as the shells are matched to the bearing/big end by the numbers on the case and crank, what do you do if you take it apart and the crank is scratched/worn? Can you buy over size shells or do you get the crank reground? I'll be taking off the big ends when it warms up bit here.
Fianl question are the big end bolts stretch bolts or can you reuse them?
Thanks in advance
Ned
Also as the shells are matched to the bearing/big end by the numbers on the case and crank, what do you do if you take it apart and the crank is scratched/worn? Can you buy over size shells or do you get the crank reground? I'll be taking off the big ends when it warms up bit here.
Fianl question are the big end bolts stretch bolts or can you reuse them?
Thanks in advance
Ned