1970-1973 Ski-Doo Snowmobiles Technical Data Manual, Page 35Get this manual
CRANKSHAFT END PLAY 1970-71-72-73 MODELS CRANKSHAFT END-PLAY Engine Type 247, 248, 249, 294,302,337, 338,343,401, 640, 434,435 End-Play .004" to .016"
No shims required; crankshaft is held on P.T.Oside by bearingNo shims required; crankshaft is held in center by groove rings
TIMING SPECIFICATION CHART
1970 MODELS
Engine Type
Direct Timing Advanced (inches B.T.D.C