Checking The Valve Springs - Yamaha T135SE Service Manual

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Yamaha T135 Service Manual
VALVES AND VALVE SPRINGS
4-28
j. Measure the valve seat width c again. If
the valve seat width is out of specification,
reface and lap the valve seat.
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EAS00241

CHECKING THE VALVE SPRINGS

The following procedure applies to all of the
valve springs.
1. Measure:
9valve spring free length a
Out of specification → Replace the valve
spring.
Valve spring free length
Intake and exhaust valve
springs
47.33 mm (1.86 in)
<Limit>: 44.96 mm (1.77 in)
2. Measure:
9compressed valve spring force a
Out of specification → Replace the valve
spring.
b Installed length
Compressed valve spring force
(installed)
Intake and exhaust valve
springs
135.6 – 156.0 N
(13.83 – 15.91 kgf) at 24.2 mm
3. Measure:
9valve spring tilt a
Out of specification → Replace the valve
spring.
Spring tilt limit
Intake and exhaust valve
springs
2.0 mm (0.08 in)
ENG