1986 Ski-Doo Factory Shop Manual, Page 46Get this manual
Section 02 ENGINE SUb-section 02 (253 ENGINE TYPE)
Spare parts pistons and cylinders are identified with green or red dotit IS Important to match the piston with the cylinder of the same colorTo minimize the effect of acceleration forces on circlip, install each circl1p so the circlip break is at o'clock as Illustrated Remove any burrs on piston caused througt' circlip installation with very fine emery cloth
- Cross torque headcyllnder nuts to 21 N.m (15 lbf.ft)- Retorque both crankcase screws to Ibfin)Bouom view