1980 Ski-Doo Shop Manual, Page 34Get this manual
SECTION 03 SUB-SECTION 01, (ENGINE TOLERANCES MEASUREMENT)
ENGINE TOLERANCES MEASUREMENT
CYLINDER TAPER
Maximum: 0.08 mm (.003")
Compare cylinder diameter 16 mm (i") from top of cylinder with down to just below the intake portOn rotary valve engines, measure just below auxiliary transfer portfacing exhaust portIf the difference ex ceeds 0.08 mm (.003") the cylinder should be rebored and honed or should be replaced
PISTON TO WALL CLEARANCE
ENGINE TYPE 247 277 354 377 444 454 464 503 PISTON TO WALL CLEARANCE MINIMUMMAXIMUM 0.065 (0026 0.060 (0024 0.080 (.0031 0.200 mm .008") 0.200 mm .008") 0.180 mm .007") 0.200 mm .008") 0.200 mm .008") 0.200 mm .008") 0.200 mm .008") 0.200 mm .008") 0.220 mm .0086")