Piston Rings; End Gap, Free End Gap; Piston Ring To Groove Clearance; Oversize Piston Ring - Suzuki RG250 Service Manual

RINGS
GAP
Check each ring for end gap, reading the gap
With
a
thickness gauge as shown in Fig. If the
end gap is found to exceed the limit, indicated
be'
ow, replace it with a new one.
The end gap of each ring is to be measure with
ring fined squarely into the cylinder bore
and held at the least worn part near the cylinder
bottom, as shown in Fig.
09900-20803
Thickness gauge
[ Service Limit 0.75 mm
FREE END GAP
• As the piston ring wears, its end gap increases
reducing engine power output because of the
resultant blowby through the enlarged gap.
Here lies the importance of using piston rings
with end gaps within the limit.
• Measure the piston right free end gap.
Mark
RN
1st
2nd
Service Limit
3.6mm
4 .2
mm
PISTON RING TO GROOVE CLEARANCE
• Fix the piston ring in the piston ring groove,
measure the ring side clearance with the thick-
ness gauge while matching the sliding surface of
piston and ring.
1 st 0.03 - 0.06 mm
STD Clearance
2nd 0.02 - 0.06 mm
OVERSIZE PISTON RING
• The following two types of oversize piston rings
are used. They bear the following identification
numbers.
Mark
Oversize
t
1 st and 2nd
0.5 mm
50
-
1.0mm 100
ENGINE 3-24
0.5
mm
0.5.
1.0
mm
0.5.