Checking The Valve Springs - Yamaha XT660R S Service Manual

VALVES AND VALVE SPRINGS
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EAS00241

CHECKING THE VALVE SPRINGS

The following procedure applies to all of the
valve springs.
1. Measure:
• valve spring free length a
Out of specification → Replace the valve
spring.
Valve spring free length
Intake
40.38 mm (1.59 in)
<Limit>: 38.36 mm (1.51 in)
Exhaust
40.38 mm (1.59 in)
<Limit>: 38.36 mm (1.51 in)
2. Measure:
• compressed valve spring force a
Out of specification → Replace the valve
spring.
b Installed length
Compressed valve spring force
(installed)
171 ~ 197 N at 35.00 mm
(17.44 ~ 20.09 kg at 35.00 mm,
38.44 ~ 44.29 lb at 1.38 in)
3. Measure:
• valve spring tilt a
Out of specification → Replace the valve
spring.
Spring tilt limit
2.5°/1.8 mm (2.5°/0.071 in)
ENG