Generic Trigger SM 50ccm - Disassembly and Installation of the Piston

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11.4 Disassembly and installation
of the piston
Disassemble the retaining ring for piston pin.
Note：When disassembling，do not drop the retaining ring
into the crankcase.
Withdraw the piston pin and unload the piston.
Unload the piston ring.
Inspect the piston, piston pin and piston ring.
Note：
Do not break or damage the piston ring.
Clean away the carbon deposit in the
piston ring groove.
Install the piston ring.
Measure the clearance of the piston ring and piston ring
groove.
Allowable limit ：
Top ring：0.09mm.
Second ring ：0.09mm。
Unload the piston ring and install each piston ring at the
bottom of the cylinder.
Note：
Press the piston ring into the air cylinder with
the piston crown.
Measure the interface clearance of the piston
ring.
Allowable limit：0.5mm.
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Testing gauge
p
iston ring
insert
p
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p
iston ring
Testing gauge