Sym Jet 50 Service Manual page 56

Piston Ring Inspection
Measure the end gap of each piston ring.
Service limit: 0.40 mm
Caution
With the piston, push each piston ring into
cylinder correctly.
Connecting Rod Inspection
Install bearing and piston pin onto connecting
rod small end, and then check its clearance.
Measure the ID of connecting rod small end.
Service limit: 17.025mm
Piston/Cylinder Installation
Install the expanding ring into the groove of 2
ring.
Align the ring end with the lock pin in the ring
groove.
Install the top ring and the 2
groove respective.
Caution
The top ring and the 2
changeable each other.
Push the rings into ring groove and then check
rings' mating condition.
If ring could not be push in the ring groove, it
means that ring groove is dirty or wrong ring
groove installation.
Caution
All rings should be installed with the marks
facing up.
All ring should be replaced at same time,
and it can not be replaced one ring only.
It should use same brand name piston ring
in an engine and can not mix with other
one.
This chapter Contents
nd
nd
ring onto the ring
nd
ring can not be
5. CYLINDER HEAD/CYLINDER/PISTON
Piston ring mark
1T: top ring
nd
2T: 2 ring
Clearance
Top ring
nd
2 ring
Expanding ring
5-7