Installing The Valves - Yamaha MT-03 Service Manual

2. Measure:
• Compressed valve spring force "a"
Out of specification
spring.
b. Installed length
Compressed valve spring force
(installed)
171-197 N at 35.00 mm
(17.44-20.09 kg at 35.00 mm,
38.44-44.29 lb at 1.38 in)
3. Measure:
• Valve spring tilt "a"
Out of specification
spring.
Spring tilt limit
2.5°/1.8 mm (2.5°/0.071 in)
Replace the valve
Replace the valve
5-25
VALVES AND VALVE SPRINGS
EAS00245

INSTALLING THE VALVES

The following procedure applies to all of the
valves and related components.
1. Deburr:
• Valve stem end
(with an oil stone)
2. Lubricate:
• Valve stem "1"
• Valve stem seal "2"
(with the recommended lubricant)
Recommended lubricant
Molybdenum disulfide oil
3. Install:
• Valve "1"
• Valve spring seat "2"
• Valve stem seal "3"
• Valve spring "4"
• Valve spring retainer "5"
(into the cylinder head)