2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 218Get this manual

2008 Yamaha Snowmobiles FX NYTRO Factory Service Manual, Page 218

VALVES AND VALVE SPRINGS After installing the valve guide, bore the valve guide with the valve guide reamer to obtain the
YM-04117 Valve guide reamer (4.5): 90890-04118 Valve guide reamer (4.5 mm): YM-04118 3Eliminate: Carbon deposits (from the
valve face and valve seat) 4Inspect: Valve face Pittingwear Grind the valve face Valve stem end Mushroom shape or diameter
larger than the body of the valve stem Replace the valve 5Measure: Valve margin thickness Out of specification Replace the