2004-2005 660 Yamaha Rhino Factory Service Manual, Page 79Get this manual
ADJUSTING THE VALVE CLEARANCE ENGINE
ADJUSTING THE VALVE CLEARANCE NOTE: The valve clearance must be adjusted when the engine is cool to the touch Adjust the valve clearance when the piston is at the Top Dead Center (TDC) on the compression strokeRemove: driver seat passenger seat console Refer to "SEATS, ENCLOSURE, HOOD AND CARGO BED" in chapter 82Lift the cargo bed up1