1978 Ski-Doo Shop Manual, Page 104Get this manual
SECTION 04 SUB-SECTION 011 (ENGINE TOLERANCES MEASUREMENT)
CRANKSHAFT DEFLECTION
Maximum: 0.06 mm (.0024")
With the crankshaft positioned between center lathe, install dial indicator as close as possible to crankshaft blade then measure deflection on each sideIf deflection exceeds 0.06 mm L0024") the crankshaft should be repaired by specialized shop or it should be replaced
CONNECTING ROD ALIGNMENT
Check if connecting rod is bent as follows:Once engine crankcase is assembled with the piston mounted on connecting rod without its piston rings, position cylinder on piston