Piston Ring End Gap - Suzuki GW250 Service Manual

PISTON RING FREE END GAP AND PISTON RING END GAP
• Measure the piston ring free end gap using the vernier cali-
pers.
• Next, fit the piston ring squarely into the cylinder and measure
the piston ring end gap using the thickness gauge.
• If any of the measurements exceeds the service limit, replace
the piston ring with a new one.
 Piston ring free end gap:
Service Limit (1st) : 4.2 mm (0.17 in)
(2nd) : 3.6 mm (0.14 in)
 09900-20101: Vernier calipers (150 mm)
 Piston ring end gap:
Service Limit (1st) : 0.50 mm (0.020 in)
(2nd) : 0.50 mm (0.020 in)
 09900-20803: Thickness gauge
OVERSIZE RINGS
Oversize piston ring
The following oversize piston ring is used. It bears the following
identification number.
Piston ring 1st and 2nd 0.5 mm: 50
Oversize oil ring
The following oversize oil ring is used. It bears the following
identification mark.
Oil ring 0.5 mm: Painted red
Oversize side rail
Measure the outside diameter to identify the size.
1 1st ring (0.5 mm O.S.)
2 2nd ring (0.5 mm O.S.)
3 Oil ring spacer (0.5 mm O.S.)
A Paint
ENGINE 3-39