Installing The Valves And Valve Springs - Yamaha 2004 YXR660 Service Manual

VALVES AND VALVE SPRINGS
11.Measure:
• compressed spring force a
Out of specification → Replace.
b Installed length
12.Measure:
• spring tilt a
Out of specification → Replace.
INSTALLING THE VALVES AND VALVE
SPRINGS
1. Apply:
• molybdenum disulfide oil
(onto the valve stem and valve stem seal)
2. Install:
• valve spring seats
• valve stem seals
• valves
• valve springs
• valve spring retainers
NOTE:
Install the valve springs with the larger pitch a
facing upwards.
b Smaller pitch
4 - 31
ENG
Compressed spring force
Intake
100.0 ~ 115.7 N at 27.5 mm
(10.20 ~ 11.80 kg,
22.49 ~ 26.01 lb at 1.08 in)
Exhaust
120.6 ~ 138.3 N at 31.0 mm
(12.30 ~ 14.10 kg,
27.12 ~ 31.09 lb at 1.22 in)
Spring tilt limit
Intake
2.5°/1.4 mm (0.055 in)
Exhaust
2.5°/1.6 mm (0.063 in)
New