2008 Polaris Sportsman 500 EFI/X2/Touring/500 H.O. Service Manual, Page 66Get this manual
ENGINE GENERAL ENGINE SERVICE
Piston Identification
The piston may have an identification mark or the piston may not have an identification mark for piston placementIf the piston has an identification mark, follow the directions for piston placement belowIf the piston does not have an identification mark, the direction for placement of the piston does not matterNote the directional and identification marks when viewing the pistons from the topThe letter "F",","ormust always be toward the flywheel side of the engineThe other numbers are used for identification as to diameter, length and designFour stroke engine rings are rectangular profileSee text for oil control ring upper rail installationUse the information below to identify pistons and ringsEngine Model NoEH50PLE EH42PLE Oversize Piston Standard Available (mm) Length Piston Identification .25 72 mm .50 .25 66 mm .50 THERMISTOR READING DURING OPERATION Condition Temperature System Capacity Radiator Cap Relief Pressure ApproxReading (Min-Max) 37.339.2 Temperature 68 (20 C)