2002-2009 Suzuki LT-F250 Ozark Service Manual, Page 68Get this manual

2002-2009 Suzuki LT-F250 Ozark Service Manual, Page 68

After the desired seat position and width is achieved, use the 45 cutter very lightly to clean up any burrs caused by the
Inspect the valve stem end face for pitting and wearIf pitting or wear of the stem end face are present, the valve stem end
may be resurfaced, providing that the length will not be reduced to less than the service limitIf this length becomes less
than the service limit, the valve must be replacedValve stem end length Service Limit: 2.5 mm (0.10 in) VALVE SPRING The
force of the coil spring keeps the valve seat tightWeakened spring result in reduced engine power output, and often account
for the chattering noise coming from the valve mechanismCheck the valve springs for proper strength by measuring their free
length and also by the force required to compress themIf the spring length is less than the service limit, or if the force
required to compress the spring does not fall within the range specified, replace both the inner and outer springs as set.