Yamaha YZF-R6T Supplementary Service Manual page 357

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VALVES AND VALVE SPRINGS
j. Measure the valve seat width c again. If the
valve seat width is out of specification, reface
and lap the valve seat.
EAS00241
CHECKING THE VALVE SPRINGS
The following procedure applies to all of the
valve springs.
1. Measure:
S valve spring free length a
Out of specification ! Replace the valve
spring.
2. Measure:
S compressed valve spring force a
Out of specification ! Replace the valve
spring.
b Installed length
5-28
ENG
Valve spring free length
Intake valve spring (inner)
35.7 mm (1.41 in)
<Limit>: 33.9 mm (1.33 in)
Intake valve spring (outer)
40.3 mm (1.59 in)
<Limit>: 38.3 mm (1.50 in)
Exhaust valve spring
41.7 mm (1.64 in)
<Limit>: 39.6 mm (1.56 in)
Compressed valve spring force
(installed)
Intake valve spring (inner)
61.5 X 70.7 N
(6.27 X 7.21 kg,
13.83 X 15.89 lb)
Intake valve spring (outer)
139.1 X 160.1 N
(14.18 X 16.33 kg,
31.27 X 35.99 lb)
Exhaust valve spring
160 X 184 N
(16.32 X 18.76 kg,
35.97 X 41.36 lb)