2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 220Get this manual

2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 220

VALVES AND VALVE SPRINGS 10Lap: Valve face Valve seat After replacing the cylinder head or replacing the valve and valve
then clean off all of the lapping compound For the best lapping results, lightly tap the valve seat while rotating the valve
back and forth between your hands Apply fine lapping compound to the valve face and repeat the above steps After every lapping
procedure, be sure to clean off all of the lapping compound from the valve face and valve seat Apply Mechanic's blueing dye
(Dykem) onto the valve face Install the valve into the cylinder head Press the valve through the valve guide and onto the