1979 Ski-Doo Supplementary Shop Manual, Page 49Get this manual
SECTION 04 SUB-SECTION 01 (ENGINE TOLERANCES MEASUREMENT)
ENGINE TOLERANCES MEASUREMENT
CYLINDER TAPER
Maximum: 0.08 mm (003" )
Compare cylinder diameter 16 mm (58") from top of cylinder with down to just below he intake portOn rotary valve engines, measure just below auxiliary transfer portfacing exhaust portIf the difference exceeds 0.08 mm (003") the cylinder should be rebored and honed or shou ld be replaced
PISTON TO WALL CLEARANCE
ENGINE TYPE PISTON TO WALL CLEARANC MINIMUMMAXIMUM
247 248 294 343 354
0.0650.170 mm (0026.0067") 0.0500.140 mm (00200055") 00500.140 mm (00200055") 0.0800.200 mm (00310079") 0.0800.200 mm (00310079") 0.0700.180 mm (0028.0071 ") 0.0700.180 mm (0028.0071) 0.0700180 mm (0028.0071 ") 0.0900.220 mm (00350087") 0.0600.160 mm (00240063") 0.0700.180 mm (00280071 ")