1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 21Get this manual
ENGINE SERVICING (SINGLE CYLINDER) circlips are seated in the piston pin groovesNOTE: Open end of circlips must face either up or downInstall circlip on magneto side before installing the pistonmaterialAlways use genuine Arctic Cat pistons for replacement
Maintaining even pressure, press cylinder down until cylinder has firmly seated on the crankcaseObserve the top of the piston; arrow must point toward the exhaust side of the engineNOTE: On 1971 model KT150 engines and prior to 1971, the arrow must point toward the PTa side of the engine
Clean the gasket areas of the crankcase and check the bottom of the cylinder for damaged surfacesInstall new cylinder base gasketLubricate the upper and lower rod bearings, sides of piston, and the cylinder walls with Arctic Cat Purple PowerlubePosition block of soft metal or wood under the piston and turn the crankshaft until both skirts (bottom edge) of the piston rest on the block (see photo below)Hold the rings with piston ring compressor (Arctic Part No0144-001) and carefully slide the cylinder over the bolts (see photo below)When the cylinder is positioned over the piston rings, carefully remove the ring compressor and the blockNOTE: Insure cylinder base gasket was not damaged when block was removed