2011 Arctic Cat 400 TRV ATV Service Manual, Page 35Get this manual
MD1343A
2Measure the corresponding piston diameter at point 15 mm (0.6 in above the piston skirt at right angle to the piston-pin boreSubtract this measurement from the measurement in step 1The difference (clearance) must be within specificationsInstalling Piston Rings 1Install ring expander (4) in the bottom groove of the piston; then install the thin oil rings (3) over the expander making sure the expander ends do not overlapStagger the end gaps of the upper and lower thin oil rings according to the illustrationNOTE: Note the direction of the exhaust side of the piston (5) for correct ring end gap orientation
CAUTION
Incorrect installation of the piston rings will result in engine damage
CYLINDERCYLINDER HEAD ASSEMBLY
NOTE: If the cylindercylinder head assembly cannot be trued, they must be replaced
CleaningInspecting Cylinder Head