Baja WD250U Service Manual page 172

Clearance between piston ring and ring groove
Standard
First 0.03~0.07mm
Ring (0.001~0.003 in)
Second 0.02~0.06mm
Ring (0.008~0.024in)
2) Measurement:
• Closed clearance of piston ring
• Install the piston ring to the cylinder, pull
forward about 20mm (0.8in), then pull the pis-
ton ring with piston top to make it vertical with
cylinder wall.
• Use feeler gauge (1)
If out of specification replace a set of ring
Closed clearance
Standard
Piston 0.15~0.30mm
ring 1 (0.006~0.012in) (0.016in)
Piston 0.15~0.30mm
ring 2 (0.006~0.012in) (0.016in)
Oil ring 0.2~0.7mm
(0.008~0.028in)
CAUTON:
You cannot measure the closed clearance of
scraping plate of oil ring assy, if the clearance
of scraping plate is bigger, replace a set of oil
ring
171
Limit
0.12mm
(0.005in)
0.12mm
(0.005in)
Limit
0.4mm
0.4mm