1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 19Get this manual
ENGINE SERVICING (SINGLE CYLINDER) 2Inspect the crankshaft seals and replace if necessaryTo insure good seal, pack the oil seal lips with bearing greaseClean the gasket surface and install new crankcase gasket, using crankcase sealer (Arctic Part No3000-211); With propane torch, heat the bearing seat of the PTO side crankcaseCAUTION: To prevent seal or gasket damage resulting in improper sealing, insure that the torch flame does not contact the seal and gasket27
Disassemble the recoil assembly (see Recoil Starter Disassembly, page 22)