Apply molybdenum disulfide oil solution to the top and
Do not mix up the top and second ring.
Install the top ring [A] so that the "R" mark [B] faces up.
Install the second ring [C] so that the "RN" mark [D] faces
If a new piston is used, use new piston ring.
Install the piston with its dent mark [A] facing forward.
Fit a new piston pin snap ring into the side of the piston
so that the ring opening [A] does not align with the slit [B]
of the piston pin hole.
Apply molybdenum disulfide oil solution to the piston pins
and piston skirt.
When installing the piston pin snap ring, compress it only
enough to install it and no more.
Do not reuse snap rings, as removal weakens and
deforms them. They could fall out and score the
Install the cylinder (see Cylinder Installation).
Cylinder Wear Inspection
Since there is a difference in cylinder wear in different di-
rections, take a side-to-side and a front-to-back measure-
ment at each of the two locations (total of four measure-
ments) shown in the figure.
If any of the cylinder inside diameter measurements ex-
ceeds the service limit, replace the cylinder.
10 mm (0.39 in.) [A]
60 mm (2.36 in.) [B]
Cylinder Inside Diameter
82.994 ∼ 83.006 mm (3.2675 ∼ 3.2679 in.)
Service Limit: 83.09 mm (3.271 in.)
ENGINE TOP END 5-39