1987-1997 Yamaha Big Bear 350 4x4 service manual, Page 83Get this manual

1987-1997 Yamaha Big Bear 350 4x4 service manual, Page 83

I 4Position: Valves Into cylinder headPress the valve through the valve guide and onto the valve seat to make clear pattern5Inspect: Valve seat surface Wherever valve seat and valve face made contact, wi have been removed6Measure: Valve seat width "a" Out of specificationPittingVariation of valve seat width Cut valve seat further
Remove just enough material to achieve satis factory seat
Seat Width: Standard:

(0.039 0.047 in)

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