Yamaha YFZ450S 2003 Service Manual page 29

Item
Valve spring
Free length
Set length (valve closed) IN
Compressed pressure
(installed)
Tilt limit
Direction of winding
(top view)
Piston
Piston to cylinder clearance
Piston size "D"
D
Measuring point "H"
Piston off set
Offset direction
Piston pin bore inside diameter
Piston pin outside diameter
Piston-pin-to-piston-pin-bore clear-
ance
ENGINE SPECIFICATIONS
IN 37.03 mm (1.46 in)
EX 37.68 mm (1.48 in)
27.87 mm (1.10 in)
EX 27.38 mm (1.08 in)
IN 111.3 ~ 127.9 N
(11.35 ~ 13.04 kg, 25.02 ~ 28.75 lb)
EX 127.4 ~ 146.4 N
(12.99 ~ 14.93 kg, 28.64 ~ 32.91 lb)
IN ----
EX ----
IN Clockwise
EX Clockwise
0.040 ~ 0.065 mm (0.0016 ~ 0.0026 in)
94.945 ~ 94.960 mm (3.7380 ~ 3.7386 in)
H
10 mm (0.39 in)
1.0 mm (0.0394 in)
Intake side
20.004 ~ 20.015 mm (0.7876 ~ 0.7880 in) 20.045 mm
19.991 ~ 20.000 mm (0.7870 ~ 0.7874 in) 19.971 mm
0.004 ~ 0.024 mm (0.0002 ~ 0.0009 in)
2 - 6
Standard
SPEC
Limit
35.17 mm
(1.38 in)
35.79 mm
(1.41 in)
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2.5°/1.61 mm
(2.5°/0.063 in)
2.5°/1.65 mm
(2.5°/0.065 in)
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----
0.10 mm
(0.004 in)
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----
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(0.789 in)
(0.786 in)
0.074 mm
(0.0029 in)