1974 Ski-Doo Shop Manual, Page 233Get this manual
Quality of the image is intentionally reduced!
The difference between should be within: Engine Type 247 302
Fitted Tolerance .0026"-.0039" 10.066 mm-0.099 mml .0031"-.0045" 10.080 mm-0.115 mml
Note: If cylinder diameter is .004"