2007 Arctic Cat Y-12 90cc ATV Service Manual, Page 36Get this manual

2007 Arctic Cat Y-12 90cc ATV Service Manual, Page 36

(Servicing Components) Piston Assembly 3-16 CylinderCylinder Head 3-17 Centrifugal ClutchDriven Pulley 3-20 Oil Pump 3-21
any carbon buildup from the dome of the piston2Inspect the piston for cracks in the piston pin, dome, and skirt areas3Inspect
the piston for seizure marks or scuffingRepair with #400 grit wet-or-dry sandpaper and water or honing oilNOTE: If scuffing
or seizure marks are too deep to repair with the sand paper, replace the piston MEASURING PISTON RING END GAP 1Place each
piston ring in the wear portion of the cylinderUse the piston to position each ring squarely in the cylinder2Using feeler
gauge, measure each piston ring end gapAcceptable ring end gap must be within specifications 4Inspect the perimeter of each
piston for signs of excessive "blowby Excessive "blowby" indicates worn piston rings or an out-of-round cylinderREMOVING
PISTON RINGS 1Starting with the top ring, slide one end of the ring out of the ring groove MEASURING PISTON PIN (Outside
Diameter) AND PISTON PIN BORE 1Measure the piston pin outside diameter at each end and in the centerMinimum diameter must