Yamaha TT-R125(S) 2003, Owner'S Service Manual

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