Yamaha YFM250RX 2008 Service Manual page 31

Item
Piston rings
Top ring
Type
Dimensions (B × T)
End gap (installed)
Side clearance
2nd ring
Type
Dimensions (B × T)
End gap (installed)
Side clearance
Oil ring
Dimensions (B × T)
End gap (installed)
Crankshaft
Crank width "A"
Runout limit C1
C2
Big end side clearance "D"
Big end radial clearance "E"
ENGINE SPECIFICATIONS
Standard
Barrel
0.90 × 2.75 mm (0.035 × 0.108 in)
0.19 ~ 0.31 mm (0.007 ~ 0.012 in)
0.030 ~ 0.065 mm (0.0012 ~ 0.0026 in)
Taper
0.80 × 2.80 mm (0.031 × 0.110 in)
0.30 ~ 0.45 mm (0.012 ~ 0.018 in)
0.020 ~ 0.055 mm (0.0008 ~ 0.0022 in)
1.50 × 2.60 mm (0.059 × 0.102 in)
0.10 ~ 0.35 mm (0.004 ~ 0.014 in)
69.25 ~ 69.30 mm (2.726 ~ 2.728 in)
• • •
• • •
0.350 ~ 0.650 mm (0.0138 ~ 0.0256 in)
0.010 ~ 0.025 mm (0.0004 ~ 0.0010 in)
2-8
SPEC
Limit
• • •
• • •
0.56 mm
(0.022 in)
0.115 mm
(0.0045 in)
• • •
• • •
0.80 mm
(0.032 in)
0.115 mm
(0.0045 in)
• • •
• • •
• • •
0.03 mm
(0.0012 in)
0.03 mm
(0.0012 in)
0.50 mm
(0.0197 in)
• • •