5-34 ENGINE TOP END
If a new piston is used, use new piston ring.
Install the piston with its marking hollow facing forward.
Fit a new piston pin snap ring into the side of the piston
so that the ring opening [A] does not coincide with the slit
[B] of the piston pin hole.
Apply molybdenum disulfide oil solution to the piston pins
and piston journals.
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).
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: 83.10 mm (3.2716 in.)
Measure the outside diameter [A] of each piston 18 mm
(0.7087 in.) [B] up from the bottom of the piston at a right
angle to the direction of the piston pin.
If the measurement is under service limit, replace the pis-
82.969 ∼ 82.984 mm (3.2665 ∼ 3.2671 in.)
Service Limit: 82.82 mm (3.2606 in.)