length YAMAHA TT600RE 2004 User Guide

ENGINSPECTION AND REPAIR
5-27
•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.

VALVE SPRINGS
1. Measure:
•Free width of valve springs (a)
Out of specification ➔Replace.
Free width of valve springs
(intake and exhaust):
Internal spring External spring 40.1 mm 43.8 mm
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
2. Measure:
•Spring load
Out of specification ➔Replace.
(b) Length of loaded spring
3. Measure:
•Inclination of spring (a)
Out of specification ➔Replace.
Spring inclination limit:
Internal spring External spring 2.5°/1.7 mm 2.5°/1.9 mm
ProCarManuals.com

ENGINSPECTION AND REPAIR
5-35
7. Measure:
•Free length of clutch compression springs
(a)
Out of specification ➔Replace all springs.
OIL PUMP
1. Measure:
•Clearance between rotors (a)
(Between the internal rotor (1) and the
external rotor (2))
•Side clearance (b)
(Between the external rotor (2) and the
pump stator (3))
Out of specification ➔Replace oil pump.
Free length of clutch compression
spring (a): 42.8 mm
Oil pump clearances:
Clearance between 0.12 mm
rotors (a) : 0.2 mm
Side clearance (b) 0.03 ~ 0.08 mm
: 0.15 mm
2. Inspect:
•Oil pump drive gear (1)
•Oil pump driven gear (2)
Wear/Cracks/Damage ➔Replace.
PRIMARY TRANSMISSION
1. Inspect:
•Primary drive gear teeth (1)
•Primary driven gear teeth (2)
Wear/Damage ➔Replace both gears.
Excess noise during functioning ➔
Replace both gears.
ProCarManuals.com