2007-2009 Suzuki LTZ90 factory service manual, Page 67Get this manual
VALVE STEM WEAR If the valve stem is worn down to the limit, as measured with micrometer, replace the valveIf the stem is within the limit, then replace the guideAfter replacing valve or guide, be sure to recheck the deflectionValve stem O.D Standard (IN)4.975 4.990 mm (0.2165 0.2170 in) (EX)4.955 4.970 mm (0.1950 0.1956 in) 09900-20205: Micrometer (0 25 mm) NOTE: If valve guides have to be removed for replacement after inspecting related parts, carry out the steps shown in valve guide servicingVALVE GUIDE SERVICING Using the valve guide remover, drive the valve guide out toward the intake or exhaust camshaft side09916-44310: Valve guide removerinstaller NOTE:Discard the removed valve guide subassemblies Only oversized valve guides are available as replacement parts(Part No11115-30D70)