2001 Yamaha YFM660 Raptor Factory Service Manual, Page 195Get this manual

2001 Yamaha YFM660 Raptor Factory Service Manual, Page 195

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ROCKER ARMS Measure
Calculate

the clearance by subtracting the rocker arm shaft outside diameter from the rocker arm inside diameterClearance greater than 0.08 mm (0.003 in) Replace