1990-2004 Yamaha YFM350X Warrior Factory Service Manual, Page 159Get this manual

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INSPECTION AND REPAIR VALVE SEAT 1 Eliminate: -Carbon deposit (from valve face and valve seat) 2 Inspect: -Valve seat PittingWear Reface the valve seat
4 Reface: -Valve seat Use 20, 45 and 60 Va

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