1985-1995 Polaris ATV and Light Utility Hauler Service Manual, Page 324Get this manual
ENGINES Magnum Engine Assembly 7Place the dowel pins in the crankcase and install new cylinder base gasket
Cylinder Installation
1Position the piston support block PN 2870390 beneath the piston skirt to support the piston during cylinder installation2Apply clean engine oil to the ring compressor (Snap OnTM PN RCL30) and install the compressor following manufacturers instructionsCAUTION: Make sure the oil control ring upper rail tab is positioned properly in the notch of the pistonVerify all ring end gaps are correctly located