2003-2006 Yamaha Snowmobile RX1 Service Manual, Page 295Get this manual
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MAINTENANCE SPECIFICATIONS Model Valve dimensions: Valve head diameter Intake Exhaust Valve face width Intake Exhaust
0.9 1.1 mm (0.035 0.043 in) 0.9 1.1 mm (0.035 0.043 in)
0.5 0.9