2013 600 IQ Racer Service Manual 9923892, Page 61Get this manual
Engine and Cooling Systems Piston Needle Bearing
1Clean the end of the connecting rod and inspect inner bore with magnifying glassLook for any surface irregularities including pitting, wear, or dents2Run fingernail around the inside of the rod and check for rough spots, galling, or wear3Oil and install needle bearing and pin in connecting rod4Rotate pin slowly and check for rough spots or any resistance to movement5Slide pin back and forth through bearing while rotating and check for rough spots
Crankshaft Index
Polaris crankshafts are pressed togetherThe connecting rod journal center lines are indexed 180 apart from each otherIt is sometimes necessary to check multi-cylinder crankshafts to verify that one cylinder has not been forced out of position relative to the other cylinderSome causes for "out of index" crankshaft include but are not limited to the following: Hydrolock from water or fuel Impact to drive clutch from object or accident Abrupt piston or other mechanical failure Engine lock-up due to drive belt failure Symptoms of an out of index crankshaft can include but are not limited to the following: Difficulty calibrating carburetor (repetitive plug fouling on one cylinder with no other cause) Unexplained piston failure on one cylinder (i.esevere detonation, broken ring lands, etc