1984 Ski-Doo Shop Manual, Page 154Get this manual
SECTION 02 ENGINE
SUB-SECTION 08 (ENGINE DIMENSIONS MEASUREMENT)
Using feeler gauge, check ring end gapIf gap exceeds specified tolerance the ring should be replaced
The difference between these two measurements should be within specified tolerance
RING PISTON GROOVE CLEARANCE
MINIMUM 0.04 mm L002") MAXIMUM (wear limit) 0.20 mm L008")
CRANKSHAFT DEFLEXION
TYPE 247 277 ,3 77 ,447, 462,503,534 MAXIMUM 0.1 mm (0.0039") 0.08 mm (0 .0031 ")
Using feeler gauge check clearance between rectangular ring and grooveIf clearance exceeds specified tolerance, replace piston