Glenn Over 8 months ago Location: Manchester, NH, USA
2004 Honda CRF450R, installed Kibble/White Stainless Valves and Kibble/White Exh/Intake Spring kit.?
The shims removed from the stock valves were .049" or 1.24mm, the retainer washers on the new Kibble/White valve springs have a deeper cup where the shim sits. What is a good starting point for the new Hot Cam shims with out a lot of assembly and disassembly for valve clearance checks, will the old shim thickness be close with the Kibble/White install height of the new valves?
MotoSport Staff Over 8 months ago Location: Portland, OR, USA
Unfortunately there is not set shim to start with when installing new valves. Luckily when installing new valves the clearance itself will be greater than it was with the old valve in there. Start by installing the current shim and measuring your valve clearance. Once you have determined the current clearance, you can do the math to figure out the correct shim to install per each valve, or use a valve shim calculator. By doing this you only have to mock the valvetrain together one time. A good shim calculator can be found here :