Yamaha XT250X - Page 168

VALVES AND VALVE SPRINGS
5-22
2. Measure:
● Compressed valve spring force “1”
Out of specification → Replace the valve
spring.
3. Measure:
● Valve spring tilt “a”
Out of specification → Replace the valve
spring.
Valve spring free length
Inner spring
Free length (intake)
36.17 mm (1.42 in)
Free length (exhaust)
36.17 mm (1.42 in)
Outer spring
Free length (intake)
36.63 mm (1.44 in)
Free length (exhaust)
36.63 mm (1.44 in)
a. Compressed valve spring force
b. Installed length
Inner spring
Installed compression spring
force (intake)
75.00–91.70 N (16.86–20.61 lbf)
(7.65–9.35 kgf)
Installed length (intake)
30.50 mm (1.20 in)
Installed compression spring
force (exhaust)
75.00–91.70 N (16.86–20.61 lbf)
(7.65–9.35 kgf)
Installed length (exhaust)
30.50 mm (1.20 in)
Outer spring
Installed compression spring
force (intake)
128.50–157.90 N (28.89–35.50
lbf) (13.10–16.10 kgf)
Installed length (intake)
32.00 mm (1.26 in)
Installed compression spring
force (exhaust)
128.50–157.90 N (28.89–35.50
lbf) (13.10–16.10 kgf)
Installed length (exhaust)
32.00 mm (1.26 in)
Spring tilt limit
Inner spring
Spring tilt (intake)
2.5 °/1.6 mm
Spring tilt (exhaust)
2.5 °/1.6 mm
Outer spring
Spring tilt (intake)
2.5 °/1.6 mm
Spring tilt (exhaust)
2.5 °/1.6 mm