Piston Pin - HYOSUNG GF125 Service Manual

PISTON
The following are reminders for piston installation:
● Rub a small quantity of HYOSUNG MOLY PASTE onto
the piston pin.
● Place a clean rag over the cylinder base to prevent
piston pin circlip from dropping into crankcase, and
then fit the piston pin circlip with long-nose pliers.
CAUTION:
Use a new piston pin circlip to prevent circlip failue
which will occur with a bent one.
● When fitting the piston, turn arrow mark on the piston
head to exhaust side.
CYLINDER
Before mounting the cylinder, oil the big end and small
end of the conrod and also the sliding surface of the pis-
ton.
● Fit dowel pins ① to crankcase and then fit gasket.
CAUTION:
To prevent oil leakage, do not use the old gasket
again, always use new one.
● Hold each piston ring with the piston rings properly
spaced and insert them into the cylinder.
Check to insure that the piston rings are properly
inserted into the cylinder skirt.
NOTE:
When mounting the cylinder, after attaching
camshaft drive chain, keep the camshaft drive
c h a i n t a u t . T h e c a m s h a f t d r i v e c h a i n m u s t
n o t b e c a u g h t b e t w e e n c a m d r i v e c h a i n
s p r o c k e t a n d c r a n k c a s e w h e n c r a n k s h a f t i s
rotated.
NOTE:
There is a holder for the bottom end of the
cam chain guide cast in the crankcase. Be
sure that the guide is inserted properly or
b i n d i n g o f t h e c a m c h a i n a n d g u i d e m a y
result.
SERVICING ENGINE 3-22
①