2004 Skidoo ZX Series Service Manual, Page 274Get this manual
Section 05 ENGINES (4-TEC) Subsection 06 (CYLINDER AND CYLINDER HEAD)
CYLINDER OUT OF ROUND mm (in) MAXIMUM (NEW) SERVICE LIMIT 0.01 mm (.0002 in) 0.02 mm (.0008 in)
CAUTION: Always replace gasket no1 before installing the cylinder
Installation
For installation, reverse the removal procedurePay attention to the following detailsNOTE: The cylinders are not identical in designDo not invert the cylinders during assemblyFirst mount cylinder 1Then remove the locking bolt (PN 529 35 900)Crank the engine further and position piston at TDCMount cylinder 2The cylinder cannot be pushed fully over the piston unless the piston is located at TDCApply engine oil in the bottom area of the cylinder bore and also on the band of the piston ring compressor toolUsing piston ring compressor plier, such Snap-On RC-980, slide piston into cylinder