Yamaha YZ250F 2008 Owner's Service Manual page 27

Stem runout limit
Valve seat width (IN)
Valve seat width (EX)
Valve spring:
Free length (IN)
Free length (EX)
Set length (valve closed) (IN)
Set length (valve closed) (EX)
Compressed force (installed) (IN)
Compressed force (installed) (EX)
Tilt limit* (IN)
Tilt limit* (EX)
Direction of winding (top view) (IN)
Direction of winding (top view) (EX)
Piston:
Piston to cylinder clearance
Piston size "D"
Measuring point "H"
Piston off-set
Piston pin bore inside diameter
Item
MAINTENANCE SPECIFICATIONS
Standard
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0.9–1.1 mm (0.0354–0.0433 in)
0.9–1.1 mm (0.0354–0.0433 in)
37.81 mm (1.49 in)
37.54 mm (1.48 in)
29.13 mm (1.15 in)
29.30 mm (1.15 in)
99–114 N at 29.13 mm (9.9–11.4 kg at
29.13 mm, 22.27–25.57 lb at 1.15 in)
126–144 N at 29.30 mm (12.6–14.4 kg at
29.30 mm, 28.44–32.41 lb at 1.15 in)
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Clockwise
Clockwise
0.030–0.055 mm (0.0012–0.0022 in)
76.955–76.970 mm (3.0297–3.0303 in)
8 mm (0.31 in)
0.5 mm (0.020 in)/IN-side
16.002–16.013 mm (0.6300–0.6304 in)
2-5
Limit
0.01 mm
(0.0004 in)
1.6 mm (0.0630
in)
1.6 mm (0.0630
in)
36.81 mm (1.45
in)
36.54 mm (1.44
in)
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2.5°/1.7 mm
(2.5°/0.067 in)
2.5°/1.6 mm
(2.5°/0.063 in)
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0.1 mm (0.004
in)
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16.043 mm
(0.6316 in)