2006-2009 Suzuki LT-R450 Service Manual, Page 75Get this manual
Remove the oil seal
[CAUTION [
l and spring seat
Do not reuse the removed oil seal
Remove the other valves in the same manner as described previously
CYLINDER HEAD DISTORTION Decarbonize the combustion chambersCheck the gasket surface of the cylinder head for distortion with straightedge and thickness gauge, taking clearance reading at several places indicatedIf the largest reading at any position of the straightedge exceeds the limit, replace the cylinder head_ Cylinder head distortion: Service Limit: 0.05 mm (0.002 in)