Yamaha WR450F(Y) 2009 Owner's Service Manual page 33

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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
Piston pin outside diameter
Piston rings:
Top ring:
Type
Dimensions (B × T)
End gap (installed)
Side clearance (installed)
2nd ring:
Item
MAINTENANCE SPECIFICATIONS
Standard
27.87 mm (1.10 in)
28.38 mm (1.12 in)
130.2–149.8 N at 27.87 mm (13.28–15.28
kg at 27.87 mm, 29.27–33.68 lb at 1.10 in)
123.1–141.7 N at 28.38 mm (12.55–14.45
kg at 28.38 mm, 27.67–31.85 lb at 1.12 in)
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Clockwise
Clockwise
0.020–0.045 mm (0.0008–0.0018 in)
94.965–94.980 mm (3.7388–3.7394 in)
8 mm (0.315 in)
1 mm (0.0394 in)
18.004–18.015 mm (0.7088–0.7093 in)
17.991–18.000 mm (0.7083–0.7087 in)
Barrel
1.2 × 3.5 mm (0.05 × 0.14 in)
0.20–0.30 mm (0.008–0.012 in)
0.030–0.065 mm (0.0012–0.0026 in)
2-6
Limit
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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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18.045 mm
(0.7104 in)
17.971 mm
(0.7075 in)
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----
0.55 mm (0.022
in)
0.12 mm (0.005
in)

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