1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 18Get this manual
ENGINE SERVICING (SINGLE CYLINDER) necting rod to prevent objects and foreign particles from falling into the crankcase23When separating the two (2) crankcase halves, hold magneto side of the case and tap the end of the crankshaft with plastic malletCAUTION: To prevent possible damage to the crankshaft and crankcase, never tap the end of the crankshaft with steel hammer
To disengage the piston from the connecting rod, remove the circlipsUsing piston pin puller (Arctic Part No0144-003), remove the piston pin24Using plastic hammer, tap the crankshaft out of the opposite crankcase half