2007 CRF 250r Valve Shims
Posted: Sat Nov 07, 2020 12:20 pm
I have a 2007 CRF 250r that I am rebuilding after purchasing it from someone. I am currently wrapping up the rebuild and trying to put the exhaust valves in spec. When putting in a smaller shim to make a bigger clearance, the shim seems to be so small that the walls of the valve spring retainer are bigger than the actual shim. When trying to measure it again I cant get a accurate reading because the valve spring retainer walls are in the way and its continuously giving me the same reading over and over again. What would cause me needing to put in a shim so small that the valve spring retainer walls are taller than the shim itself therefore not allowing me to adjust to the proper clearance?