questions in a crank swap since mines bad

[Wheeliest]

I've built several 954 motors and 07 gsxr 1k motors, and believe me, you get the same plasti gauge numbers with every color bearing. even used un matched cases, those motors are still going strong. there is a shit load of lee way in the tolerances which you would think it would lead to catastrophic failure quite quickly and it doesn't.

Quote:

Originally Posted by JohnnyP Thats not correct man, if the bearings arent the right size your rebuild will last 5 minutes... There are numbers on the crank, engine cases and rod ends...Those are used to find the correct bearing size..And usually is more then one different size in one engine... The chances of getting a used crank that shares the same numbers as your engine is like a million to one...If its too tight they will fail right away, if its too loose they will fail very soon also... Running loose tolerance for a race engine is for power, but not for reliability...And theres a huge difference between running loose tolerance that has been measured and calculated and just using a different crank without the proper bearings or even checking the clearance