ATV 250 Service Manual page 177

Clearance between piston ring and ring groove
First ring
Second
ring
2)Measurement
.Closed clearance of piston ring
.Install the piston ring to the cylinder,pull for-
¡ý
ward about 20mm(0.8 in),then pull the piston
20mm(0.8 in)
ring with piston top to make it vertical with cyl-
¡ü
inder wall.
.Use feeler gauge ¢Ù
If out of specification replace a set of ring
Piston
ring 1
Piston
ring 2
Oil ring
Caution
You cannot measure the closed clearance of
scraping place of oil ring assy,if the clearance
of scraping plate is bigger,replace a set of oil
ring
Standard
0.03-0.07mm
(0.001-0.003 in)
0.02-0.06mm
ring (0.008-0.024 in)
close deamance
Standard
0.15-0.30mm
(0.006-0.012in)
0.15-0.30mm
(0.006-0.012in)
0.2-0.7mm
(0.008-0.028 in)
Limit
0.12mm
(0.005 in)
0.12mm
(0.005 in)
Limit
0.4mm
(0.016in)
0.4mm
(0.016in)
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