03-15-2018, 04:52 AM
Shim under bucket has a MUCH less chance of “tiddlywinking” when over-revved.
Shim under bucket has MUCH less wear on associated parts which equates to not going out of spec for valve clearance.
Shim under bucket is MUCH more involved to adjust clearance.
Shade tree mechanics probably risk doing more harm than good and should not remove cams in super skillfully built professional factory built engines, and trusting someone else to do so has its risks as well. They are PERFECT from the get-go.
Only abused, over-revved, dirty oil, high mileage modern Japanese motors ever require valve adjustment. Even then, they won’t break or have catastrophic failure. Motocross singles are the exception, they need regular adjusting and rebuilding.
Shim under bucket has MUCH less wear on associated parts which equates to not going out of spec for valve clearance.
Shim under bucket is MUCH more involved to adjust clearance.
Shade tree mechanics probably risk doing more harm than good and should not remove cams in super skillfully built professional factory built engines, and trusting someone else to do so has its risks as well. They are PERFECT from the get-go.
Only abused, over-revved, dirty oil, high mileage modern Japanese motors ever require valve adjustment. Even then, they won’t break or have catastrophic failure. Motocross singles are the exception, they need regular adjusting and rebuilding.