Yamaha YFM250RX 2008 Service Manual page 29

Item
Valve spring
Inner spring
Free length
Installed length
(valve closed)
Spring rate K1
K2
K1
K2
Compressed spring force
(installed)
Tilt limit
Direction of winding
(top view)
Outer spring
Free length
Installed length
(valve closed)
Spring rate K1
Spring rate K2
Spring rate K1
Spring rate K2
Compressed spring force
(installed)
ENGINE SPECIFICATIONS
IN 36.17 mm (1.42 in)
EX 36.17 mm (1.42 in)
IN 30.50 mm (1.20 in)
EX 30.50 mm (1.20 in)
IN 14.70 N/mm (1.50 kg/mm, 83.94 lb/in)
IN 19.00 N/mm (1.94 kg/mm, 108.49 lb/in)
EX 14.70 N/mm (1.50 kg/mm, 83.94 lb/in)
EX 19.00 N/mm (1.94 kg/mm, 108.49 lb/in)
IN 75.00 ~ 91.70 N
(7.65 ~ 9.35 kg, 16.86 ~ 20.62 lb)
EX 75.00 ~ 91.70 N
(7.65 ~ 9.35 kg, 16.86 ~ 20.62 lb)
IN • • •
EX • • •
IN Counter clockwise
EX Counter clockwise
IN 36.63 mm (1.44 in)
EX 36.63 mm (1.44 in)
IN 32.00 mm (1.26 in)
EX 32.00 mm (1.26 in)
IN 30.90 N/mm (3.15 kg/mm, 176.44 lb/in)
IN 40.80 N/mm (4.16 kg/mm, 232.97 lb/in)
EX 30.90 N/mm (3.15 kg/mm, 176.44 lb/in)
EX 40.80 N/mm (4.16 kg/mm, 232.97 lb/in)
IN 128.50 ~ 157.90 N
(13.10 ~ 16.10 kg, 28.89 ~ 35.50 lb)
EX 128.50 ~ 157.90 N
(13.10 ~ 16.10 kg, 28.89 ~ 35.50 lb)
2-6
SPEC
Standard Limit
34.36 mm
(1.35 in)
34.36 mm
(1.35 in)
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2.5°/1.60 mm
(2.5°/0.063 in)
2.5°/1.60 mm
(2.5°/0.063 in)
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34.80 mm
(1.37 in)
34.80 mm
(1.37 in)
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