Yamaha TT-R125(R) 2002 Owner's Service Manual page 268

VALVES AND VALVE SPRINGS
2. Measure:
b Installed length
3. Measure:
ASSEMBLY AND INSTALLATION
Valve
1. Apply:
2. Install:
NOTE:
Make sure that each valve is installed in its
G
original place.
Install the valve springs with the larger pitch
G
a facing upwards.
b Smaller pitch
4 - 30
Compressed spring force a
G
Out of specification → Replace.
Compressed spring force:
Intake:
14.0 ~ 16.1 kg at 25.6 mm
(30.86 ~ 35.49 lb at 1.01 in)
Exhaust:
14.0 ~ 16.1 kg at 25.6 mm
(30.86 ~ 35.49 lb at 1.01 in)
Spring tilt a
G
Out of specification → Replace.
Spring tilt limit:
Intake:
2.5˚/1.4 mm (0.06 in)
Exhaust:
2.5˚/1.4 mm (0.06 in)
Molybdenum disulfide oil
G
(onto the valve stem and valve stem
seal)
Valve spring seats 1
G
Valve stem seals 2
G
Valves 3
G
Valve springs 4
G
Valve spring retainers 5
G
ENG
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