2006-2008 Polaris Snowmobiles FS/FST Service Manual., Page 166Get this manual
FSFST Engine CrankcaseCrank TrainPiston Assembly
1Position the upper crankcase as shown in the photo87Repeat process to install the second piston assemblyWipe up any excess oil leftover from the piston installation processPosition the upper crankcase as shown in the photoClean each bearing journal
23Prepare each piston assembly for installation into the crankcaseLubricate each piston assembly with engine oilPlace the piston installation tool, PN PW-46983, over one of the piston boresLubricate the inner diameter of the tool with engine oilPosition one piston assembly inside the tool and align each ring end gap as illustrated