2011 Arctic Cat 450XC Service Manual, Page 21Get this manual
EngineTransmission This section has been organized into sub-sections which show progression for the complete servicing of the Arctic Cat ATV enginetransmissionTo service the center crankcase halves, the enginetransmission must be removed from the frameTo service topside, left-side, and right-side components, the engine transmission does not have to be removed from the frameNOTE: Use new gaskets, lock nuts, and seals and lubricate all internal components when servicing the enginetransmission
Specifications
CYLINDER, PISTON, AND RINGS Piston SkirtCylinder Clearance 0.025-0.055 mm Piston Diameter mm from Skirt End 88.96-89.01 mm Piston Ring Free End Gap (min) (1st) 8.0 mm (2nd) 8.3 mm Bore Stroke 89.0 71.2 mm Cylinder Trueness (max) 0.01 mm Piston Ring End GapInstalled (min) 0.15 mm Piston Ring to Groove Clearance (max) (1st2nd) 0.06 mm Piston Ring Groove Width (1st) 1.01-1.03 mm (2nd) 1.21-1.23 mm (oil) 2.01-2.03 mm Piston Ring Thickness (1st2nd) 1.97-1.99 mm Piston Pin Bore (max) 20.20 mm Piston Pin (min) 19.994 mm VALVES AND GUIDES Valve Face Diameter (intake) 35.0 mm (exhaust) 30.5 mm ValveTappet Clearance (cold engine) (intake) 0.10 mm (exhaust) 0.17 mm