2004 Skidoo ZX Series Service Manual, Page 138Get this manual
Section 04 ENGINES (2-STROKE) Subsection 02 (593, 593 HO SDI, 693 AND 793 SDI ENGINE TYPES)
A32CBHA
A02C2IA
CAUTION: Piston temperature must not exceed 46C (115F)NEVER USE DIRECT FLAME to heat the piston and never freeze the pinInappropriate heating procedure(s) may damage the pistonAt assembly, place the pistons over the connecting rods with the letters AUS (over an arrow on the piston dome) facing towards the exhaust port
TYPICAL SHOULDERED SLEEVE INSTALLATION
Install piston pin puller and turn handle until piston pin is correctly positioned in piston