2004-2005 660 Yamaha Rhino Factory Service Manual, Page 80Get this manual
ADJUSTING THE VALVE CLEARANCE 7Remove: engine cooling fan 1
8Remove: timing plug 1
9Check: valve clearance Out of specification AdjustValve clearance (cold) Intake 0.100.15 mm (0.00390.0059 in) Exhaust 0.150.20 mm (0.00590.0079 in)