Valve Springs - Yamaha TT600R Service Manual

INSPECTION AND REPAIR
•
Apply Prussian blue (Dykem) to the valve seal
surface.
•
Install the valve in the cylinder head.
•
Press the valve onto the housing through the
guide to leave a clear outline.
•
Measure the valve seat width once more. If
the width of the valve is out of specification
alter and relap.
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VALVE SPRINGS

1. Measure:
•
Free width of valve springs (a)
Out of specification ➔ Replace.
Free width of valve springs
(intake and exhaust):
Internal spring
40.1 mm
2. Measure:
•
Spring load
Out of specification ➔ Replace.
(b) Length of loaded spring
Valve spring load:
Internal spring (intake and exhaust)
164.8 ~ 190.2 N
(16.80 ~ 19.39 kgf) at 22.7 mm
External spring (intake)
71.6 ~ 87.3 N
(7.3 ~ 8.9 kgf) at 34.2 mm
External spring (exhaust)
149.1 ~ 182.4 N
(15.2 ~ 18.6 kgf) at 34.2 mm
3. Measure:
•
Inclination of spring (a)
Out of specification ➔ Replace.
Spring inclination limit:
Internal spring
2.5°/1.7 mm
5-27
ENG
External spring
43.8 mm
External spring
2.5°/1.9 mm