Yamaha YFM250RX 2008, Service Manual

Page: 29 / 311

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