Yamaha YBR250 2007, Service Manual

Page: 22 / 361

SPEC
ENGINE SPECIFICATIONS
Item Standard Limit
12.000~12.018 mm
(0.4724 ~0.4731 in)
11.981~11.991 mm
(0.4717 ~0.4721 in)
0.009~0.037 mm
(0.0003 ~0.0014 in)
0.05~0.10 mm (0.002 ~0.004 in)
0.08~0.13 mm (0.003 ~ 0.005 in)
33.90~34,10 mm (1.33 ~ 1.34 in)
28.40~28,60 mm (1.11 ~ 1.12 in)
2.260 mm (0.089 in)
2.260 mm (0.089 in)
0.90~1,10 mm (0.03 ~ 0.04 in)
0.90~1,10 mm (0.03 ~ 0.04 in)
0.80~1.20 mm (0.032 ~ 0.047 in)
0.80~1.20 mm (0.032 ~ 0.047 in)
5.975~5.990 mm (0.23524 ~ 0.23583 in)
5.960~5.975 mm (0.23464 ~ 0.23524 in)
6.000~6.012 mm (0.23622 ~ 0.23669 in)
6.000~6.012 mm (0.23622 ~ 0.23669 in)
12.036mm
(0.4739 in)
11.955mm
(0.4707 in)
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5.950 mm
(0.23425 in)
5.935 mm
(0.23366 in)
6.042 mm
(0.23787 in)
6.042 mm
(0.23787 in)
Rocker / Rocker shaft
Rocker inner diameter
Shaft outer diameter
Gap between rocker and shaft
Valves, valve seats, valve guides
Valve clearance (cold)
Intake
Exhaust
Valve dimensions
Diameter A
Intake
Exhaust
Face width B
Intake
Exhaust
Seat width C
Intake
Exhaust
Diameter thickness D
Intake
Exhaust
Valve stem diameter
Intake
Exhaust
Valve guide inner diameter
Intake
Exhaust
Head diameter Face width Seat width Margin thickness
2-4