Assembly Of Piston - TGB Hornet 50 Service Manual

4-3-3 Assembly of Engine

3. Assembly of Piston

A. Apply TGB oil (GA50400002) on
the needle roller bearing ¡ @
at the small end of con-rod.
B. Install the piston ring (3) on
the piston (2). (FOR 50C.C.)
a. The 2nd ring (6) is engraved 2R
mark which should face upwards
while installing. Put the expansion
ring (8) insert into the piston first,
and then install the 2nd ring.
b. There is a cone surface on the
1st ring (7), place the engraved
surface with R mark upwards while
installing.
¡ · The opening of piston ring should
point to the knock-pin(9)of piston
while installing.
¡ ·
Do not put too much force while
open to let the piston through, so
that the piston ring will not be
damaged.
¡ °
For 90C.C. engine, there are two
cone piston Rings without expansion
ring.
C. Install the cir-clip (5) of piston pin into
the cir-clip groove of piston.
¡ ·
The cir-clip has to be actually
installed into the groove,or it will
cause cylinder jam during operation.
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