1989 Ski-Doo Repair Manual, Page 210Get this manual
Sub-section 09
Section 02 ENGINE (ENGINE DIMENSION MEASUREMENT)
ENGINE DIMENSION MEASUREMENT
This section covers these engine types247,253,377,
467, 503, 536, 583
CYLINDER TAPER
253 Engine type
Not applicable
Measuring 16 mm (58 in) from top of cylinder with cvlinder gauge, check if the cylinder Ollt of round is more than the specified dimensionIf larger, cylinder should be rebored and honed or should be replaced
Gudgeon pir
:lirp.c tion
All other engines
MAXIMUM: 0.08 mm 1.003
Compare cylinder diameter 16 mm (58 in) from top of cylinder to just below its intake port areaOn rotary valve engines, measure just below auxiliary transfer portfacing exhaust portIf the difference exceeds 0.08 mm (,003 inl fhe cylinder should be rebored and honed or should be replaced