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Disassembly of piston
Remove piston pin washer with needle-nose pliers and
remove piston pin and piston.
note
：
Do not drop the piston pin washer into the
crankcase while removing it.
Inspection of piston and piston pin
Remove piston ring
；
note
：
do not damage piston ring
Measure the clearance between piston ring and piston
ring groove
Maintenance limit
：
first ring
：
0.08mm
Second ring
：
0.08 mm
Oil ring
：
0.08 mm
Check the piston for wear and tear and the piston ring
grooves for wear and tear
.
Insert the piston ring into the cylinder and measure the
end gap.
Maintenance limit
：
first ring
：
0.5mm
Second ring
：
0.5mm
Oil ring
：
1.4 mm
