Service Manual

8-18
Table of Contents
Twin Cylinder Engine Service Manual
February 2017 - Digital Edition
ENGINE INSPECTION AND RECONDITIONING
Lower End Inspection and Reconditioning (Cont.)
Pistons (Cont.)
NOTE: If piston is damaged or out of specication, replace piston, piston rings and piston clips.
6. Piston Pin (wrist) inspect and measure:
Inspect pin and clips, measure and compare to specifications, (Figure 17).
Piston Pin (Wrist) outside diameter
Standard (Height) 0.669-0.6692 in. (16.992-16.998 mm)
Service Limit 0.6654 (16.90 mm)
7. Piston Clips inspection:
Inspect each clip if damaged, or out of round. Replace if failed (Figure 18).
Figure 17
Figure 18
Assembly:
. Put the piston ring sign facing up when assembling.
. Don’t wrongly assemble the top ring and the second
ring.
. After assembling, be sure the piston can freely
move.
. Stagger the open of the piston to piston pin hole
with 120 degree.
Top ring
The second ring
Oil ring
Piston
Sign
Top ring
The second ring
Oil ring
Check, refer to
Piston pin
Piston ring clip
Assembly: Put the one end into the
piston slot, clamp other end by
sharp nose pliers and revolve into
slot. Don’t let the open of clip
aiming at the piston pin slot..
Connecting rod
Assembly: Put the long end of the
connecting rod aiming at the triangular
mark when assembling.
CLIP
CUT-OUT