HYOSUNG RX 125 Service Manual page 51

3-21 ENGINE
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 pre-
vent 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
failure 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 sur-
face of the piston.
● Fit dowel pins ① to crankcase and then fit gasket.
CAUTION
To prevent oil leakage, do not use the old gas-
ket again, always use new one.
● Hold each piston ring with the piston rings prop-
erly spaced and insert them into the cylinder.
Check to insure that the piston rings are properly
inserted into the cylinder skirt.
CAUTION
When mounting the cylinder, after attaching
camshaft drive chain, keep the camshaft drive
chain taut. The camshaft drive chain must not be
caught between cam drive chain sprocket and
crankcase when crankshaft is rotated.
CAUTION
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 binding of the
cam chain and guide may result.
①