Yamaha YBR250 2007, Service Manual

Page: 24 / 361

SPEC
ENGINE SPECIFICATIONS
Forward inclined 1-cylinder
74.000 ~ 74.016 mm (2.913 ~ 2.914 in)
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0.010~0.025 mm (0.0004 ~ 0.0010 in)
73.983~73.998 mm
(2.9127 ~ 2.9133 in)
5.0 mm (0.20 in)
0.50 mm 0.020 in)
Intake side
17.002~17.013 mm
(0.6694 ~ 0.6698 in)
16.991~17.000 mm
(0.6689 ~0.6692 in)
Barrel
0.90 x 2.75 mm (0.0354 x 0.1083 in)
0.19~0.31 mm (0.0075 x 0.0122 in)
0.030~0.065 mm (0.0011 ~ 0.0026 in)
74.10 mm
(2.917 in)
0.05 mm
(0.002 in)
0.05 mm
(0.002 in)
0.15mm
(0.006 in)
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17.043 mm
(0.6709 in)
16.97mm
(0.6681 in)
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0.60mm
(0.0236 in)
0. 10mm
(0.004 in)
Cylinder
Cylinder arrangement
Bore
Taper
Out of round
Piston
Piston-to-cylinder clearance
Diameter D
Height H
Offset
Offset direction
Piston pin bore (in the piston)
Diameter
Piston pin
Outside diameter
Piston rings
Top ring
Ring type
Dimensions (B x T)
End gap (installed)
Ring side clearance
Item Standard Limit
2-6