Valve Spring Inspection; Valve Lifter Inspection - Yamaha WR426F(P) Owner's Service Manual

VALVES AND VALVE SPRINGS
Valve spring
1. Measure:
2. Measure:
b Installed length
3. Measure:
Valve lifter
1. Inspect:
4 - 39
Valve spring free length a
G
Out of specification → Replace.
Free length (valve spring):
Intake:
41.36 mm (1.63 in)
<Limit>: 39.3 mm (1.55 in)
Exhaust:
43.60 mm (1.72 in)
<Limit>: 41.4 mm (1.63 in)
Compressed spring force a
G
Out of specification → Replace.
Compressed spring force:
Intake:
11.5 ~ 13.2 kg at 32.87 mm
(25.35 ~ 29.10 lb at 1.29 in)
Exhaust:
11.9 ~ 13.7 kg at 35.38 mm
(26.23 ~ 30.20 lb at 1.39 in)
Spring tilt a
G
Out of specification → Replace.
Spring tilt limit:
Intake:
2.5˚/1.8 mm (0.071 in)
Exhaust:
2.5˚/1.9 mm (0.075 in)
Valve lifter
G
Scratches/damage → Replace both lift-
ers and cylinder head.
ENG