2009 Polaris Sportsman 850 XP EFI EPS Service Manual, Page 144Get this manual
ENGINE PistonConnecting Rod Assembly
1Lubricate connecting rod small end, piston pin bore, and piston pin with engine oil
PistonConnecting Rod Installation
12Apply clean engine oil to piston assembly and cylinder walls of upper crankcaseBe sure ring end gaps are positioned at least 120 degrees apartOil ring rails at least 60 degrees apart(See "Piston Ring Installation" on page 5.51)Apply engine oil to ring compressor band and install band (A) over piston rings