1974 Ski-Doo Shop Manual, Page 236Get this manual
The difference between these two measurements should be within: Engine type Fitted tolerance Wear limit .0054" 10.135 mml .0076" 10.195 mml .0084" 10.215 mml .0092" 10.235 mml .0085" 10.216 mml
Crankshaft deflection
With the crankshaft position between center lathe, install dial indicator as close as possible to crank shaft blade, then measure deflection on each sideIf deflection exceed .0032" 10.99 mm) the crankshaft should be repaired by specialized shop or it should be replaced
248,294, .0020"-.0034" 10.050 mm-0.085 mml 338,343,} .0031"-.0045" 10.080 mm-0.115 mml 401,434, 396,640,} .0035"-.0049" 10.090 mm-0.125 mml 436, 346, 440, .0039"-.0053" 10.100 mm-O.135 mml .0037"-.0048" 10.093 mm-0.123 mml
Note: If cylinder diameter is .004" (Q7 mm) larger than nominal, the cylinder should be reba red
Ring end gap
Position ring half way between transfer port and intake portUsing feeler gauge, check ring end gapIf gap exceed .062" 11.59 mm) the ring should be replaced