1978 Ski-Doo Shop Manual, Page 102Get this manual
SECTION 04 SUB-SECTION 01 (ENGINE TOLERANCES MEASUREMENT)
:ENGINE TOLERANCES MEASUREMENT
CYLINDER TAPER
Maximum: 0.08 mm (.003")
Compare cylinder diameter 16 mm (58") from top of cylinder with down to just below the intake portOn rotary valve engines, measure just below auxiliary transfer port, facing exhaust portIf the difference exceeds 0.08 mm (,003") the cylinder should be rebored and honed or should be replaced
PISTON TO WALL CLEARANCE
ENGINE TYPE PISTON TO WALL CLEARANCE MACHINING TOLERANCES WEAR LIMIT
247 248 294 305
0.063-0.099 mm (.0025-.0039") 0.048-0.083 mm (.0019-.0033"0.050-0.085 mm (.0020-.0033"0.068-0.104 mm (.0027-.0041 ") 0.078-0.114 mm (,0031-.0045") 0.048-0.083 mm (,0019-.0033") 0.099-0.134 mm (,0039-.0053") 0.080-0.115 mm (.0032-.0045") 0.068-0.104 mm (,0027-.0041 ") 0.070-0.105 mm (,0028-.0041 ") 0.070-0.105 mm (.0028-.00410.068-0.104 mm (.0027-.0041")