Yamaha XC125 Service Manual page 161

sPEc CATO., IAPP×I
i
Model XC 125S
Piston Ring:
Sectional Sketch
L__ __ _B TopRing Barrel
V B = 1.0 mm (0.039 in)
-r T = 2.0 mm (0.079 in)
L___ __ AB 2ndRing Taper
V B = 1.0 mm (0.039 in)
T T = 2.0 mm (0.079 in)
B = 2.0 mm (0.079 in)
Oil Ring
T = 2.2 mm (0.087 in)
End Gap (Installed)/< Limit >: Top Ring 0.15 _ 0.30 mm (0.006 _ 0.012 in)/
< 0.4 mm (0.016 in) >
2nd Ring 0.15 _ 0.30 mm (0.006 _ 0.012 in)/
< 0.4 mm (0.016 in) >
Oil Ring 0.3 _ 0.9 mm (0.012 _- 0.035 in)/
< 0.4 mm (0,016 in) >
Side Clearance/< Limit >: Top Ring 0.03 _ 0.07 mm (0,0012 _ 0.0028 in)/
< 0.12 mm (0.0047 in) >
2nd Ring 0.02 _ 0.06 mm (0.0008 _ 0.0024 in)/
< 0.12 mm (0.0047 in) >
Crankshaft:
Crank Width "A" 44.95 "" 45.00 mm (1.770 "_ 1.772 in)
Runout Limit "B": Left: 0.01 mm (0.0004 in)
Right: 0.03 mm (0.0012 in)
Big End Side Clearance "C"/< Limit>: 0.05 _ 0.45 mm (0,0020 _ 0.0177 in)/
< 0.5 mm (0.0197 in) >
Big End Radial Clearance "D" 0.004 _ 0.019 mm (0,00016 _ 0.00075 in)
D
Small End Free Play "E"/< Limit >:I 0.8 _ 1.0 mm (0.031 _ 0.039 in)/
E < 1.5 mm (0.059 in) >
A
Balancer Drive Method: Gear
Clutch :
Clutch Shoe Thickness 3.5 mm (0.138 in)
< Wear Limit > < 2.0 mm (0.079 in) >
Sliding Spring Free Length 76.8 mm (3.02 in)
< Limit > < 71.0 mm (2.80 in) >
V-Belt Width 19.5 mm (0.77 in)
<Wear Limit> < 17.5 mm (0.69 in) >
Clutch-In Revolution 2,500 _ 2,900 r/min
Clutch-Stall Revolution 3,700 _ 4,300 r/min
7-6