Piston Ring - HYOSUNG 2010 ST7 Service Manual

3-51 ENGINE
MAGNETO COVER
Install the new gasket and dowel pin.
Apply oil to the each gear, bearing and starter clutch.
Install the magneto cover and tighten the magneto
cover bolts.
Magneto cover bolt

PISTON RING

First, install the piston ring in order of oil ring, 2nd
ring and 1st ring at the front cylinder.
CAUTION
Be careful not to cause scratch on the piston
when inserting the piston ring to the piston.
Also, do not expand the piston ring more than
necessary as the ring can break.
When all the piston rings have been assembled,
check that each can turn smoothly.
To minimize compression and oil leaks, locate each
piston ring end gap in the position as shown in the
right illustration
Install the spacer ①
Install the upper and lower side rail ②
PISTON
Apply the MOLY PASTE to the piston pin.
MOLY PASTE
When installing the piston, turn the mark
piston head to exhaust side.
After the piston pin has been inserted through the
conrod, install the circlip ③.
CAUTION
Replace the circlip with a new one.
Place a piece of rag under the piston when
installing the circlip to prevent it from falling into
the crankcase.
: 10 N m (1.0 kgf m)
②
①
②
on the
EX
②
①
IN
②
③