davewnh
CB750 Member
Hello all! I thought I'd have some fun with a 1980 CB750F engine I have lying around and upgrade the internals.
First stop is getting the block bored out and re-sleeved to 890cc with a Wiseco kit I recently picked up. So far that seems like the easy part. I know I want to upgrade the cams and valve components, and have the crank balanced. The question I have is if I upgrade the connecting rods.
This upsize brings the 9.0:1 compression to 10.25:1. I can take my old connecting rods and check them on a liquid MT bath for stress fractures and integrity, but this being the first time I've tinkered around with an engine I just don't know if the original rods will handle the increased force. I've been quoted a new Carrillo set for $1150.00, that's a tough pill to swallow. Do any of you know if that's the right investment to make, or are the original rods perfectly capable of handling the job?
Any helpful info or tips would be greatly appreciated. Thanks!
First stop is getting the block bored out and re-sleeved to 890cc with a Wiseco kit I recently picked up. So far that seems like the easy part. I know I want to upgrade the cams and valve components, and have the crank balanced. The question I have is if I upgrade the connecting rods.
This upsize brings the 9.0:1 compression to 10.25:1. I can take my old connecting rods and check them on a liquid MT bath for stress fractures and integrity, but this being the first time I've tinkered around with an engine I just don't know if the original rods will handle the increased force. I've been quoted a new Carrillo set for $1150.00, that's a tough pill to swallow. Do any of you know if that's the right investment to make, or are the original rods perfectly capable of handling the job?
Any helpful info or tips would be greatly appreciated. Thanks!