Use new piston rings and a feeler gauge to measure for
ring groove wear.
Replace the piston if the gaps are worn larger than the
dimensions listed below.
Ring to Groove Clearance
Piston Ring (Top)
Piston Ring (2nd)
Piston Ring (Oil)
Measure the piston pin bore.
Replace the piston if the bore is worn larger than 17.49
Inspect the cylinder bore of the crankcase for scoring or
If the cylinder bore is damaged, bore or hone the
cylinder for oversized piston and rings.
Use a dial bore gauge, Part No. 3375072, to measure
the cylinder bore diameter.
Measure at 25.0 mm [1.00 inch] below the top of the
Maximum out-of-round is 0.038 mm [0.0015-inch].
If the crankcase bore is not within specifications, bore
the cylinder to use oversize piston and rings.