Yamaha TTR250L Service Manual page 28

Model
Piston rings:
Top ring
Type
Dimensions (B × T)
End gap (installed)
<Limit>
Side clearance (installed)
<Limit>
Plating/coating
2nd ring:
Type
Dimensions (B × T)
End gap (installed)
<Limit>
Side clearance
<Limit>
Plating/coating
Oil ring:
Dimensions (B × T)
End gap (installed)
Side clearance
Plating/coating
Connecting rod:
Connecting rod length
Crankshaft:
Crank width "A"
<Runout limit "C">
Big end side clearance "D"
Big end radial clearance "E"
Small end free play "F"
Balancer:
Balancer drive method
Clutch:
Friction plate thickness
Quantity
<Friction plate wear limit>
Clutch plate thickness
Quantity
<Warp limit>
Clutch spring free length
Quantity
Minimum length
Clutch housing thrust clearance
Clutch housing radial clearance
MAINTENANCE SPECIFICATIONS
Barrel
B
1.0 × 3.1 mm (0.039 × 0.122 in)
T
0.20 ~ 0.35 mm (0.008 ~ 0.014 in)
<0.4 mm (0.016 in)>
0.04 ~ 0.08 mm (0.0016 ~ 0.0031 in)
<0.12 mm (0.005 in)>
Chrome plated/parkerizing
Taper
B
1.0 × 3.1 mm (0.039 × 0.122 in)
T
0.20 ~ 0.35 mm (0.008 ~ 0.014 in)
<0.4 mm (0.016 in)>
0.03 ~ 0.07 mm (0.001 ~ 0.003 in)
<0.12 mm (0.005 in)>
Parkerizing
2.0 × 2.5 mm (0.079 × 0.098 in)
B
0.2 ~ 0.7 mm (0.008 ~ 0.028 in)
T
0.060 ~ 0.155 mm (0.002 ~ 0.006 in)
Chrome plated/parkerizing
102.4 ~ 102.6 mm (4.03 ~ 4.04 in)
F
60.25 ~ 60.30 mm (2.372 ~ 2.374 in)
C
C
<0.03 mm (0.0012 in)>
0.35 ~ 0.85 mm (0.014 ~ 0.033 in)
E
0.010 ~ 0.025 mm (0.0004 ~ 0.0010 in)
D
0.8 mm (0.0315 in)
A
Gear
2.9 ~ 3.1 mm (0.114 ~ 0.122 in)
7 pcs
<2.7 mm (0.11 in)>
1.5 ~ 1.7 mm (0.059 ~ 0.067 in)
6 pcs
<0.05 mm (0.002 in)>
42.8 mm (1.69 in)
5 pcs
40.8 mm (1.61 in)
0.08 ~ 0.33 mm (0.003 ~ 0.013 in)
0.010 ~ 0.044 mm (0.0004 ~ 0.0017 in)
2 - 7
SPEC
TTR250L(C)