Yamaha Motor Co., Ltd. YFM7FGPW — VALVES AND VALVE SPRINGS

2. Replace: valve guide NOTE: _ To ease valve guide removal and installation, and to maintain the correct fit, heat the cylinder head to 100 °C (212 °F) in an oven. MMM M M MMM M M MMM M M MMM M M MMM M M MMM M MMM a. Remove the valve guide using a valve guide remover 1 . b. Install the new valve guide using a valve guide remover 1 and valve guide installer 2 . c. After installing the valve guide, bore the valve guide using a valve guide reamer 3 to obtain proper stem-to-guide clearance.

Valve guide remover (ш6) 90890-04064 Valve guide remover (6.0 mm) YM-04064-A Valve guide installer (ш6) 90890-04065 Valve guide installer (6.0 mm) YM-04065-A Valve guide reamer (ш6) 90890-04066 Valve guide reamer (6.0 mm) YM-04066 LLL L L LLL L L LLL L L LLL L L LLL L L LLL L LLL NOTE: _ After replacing the valve guide, reface the valve seat. 3. Check: valve face Pitting/wear Grind the face. valve stem end Mushroom shape or diameter larger than the body of the valve stem Replace. 4 - 28 VALVES AND VALVE SPRINGS ENG Valve guide position a 12.7 ~ 13.1 mm (0.50 ~ 0.52 in)