Checking The Valve Lifters; Installing The Valves - Yamaha 2004 YP400 Service Manual

2
1
VALVES AND VALVE SPRINGS
3. Measure:
EAS00242

CHECKING THE VALVE LIFTERS

The following procedure applies to all of the
valve lifters.
1. Check:
EAS00245

INSTALLING THE VALVES

The following procedure applies to all of the
valves and related components.
1. Deburr:
2. Lubricate:
3. Install:
5
4
3
5 - 28
• valve spring tilt a
Out of specification → Replace the valve
spring.
Spring tilt limit
2.0 mm (0.08 in)
• valve lifter
Damage/scratches → Replace the valve lift-
ers and cylinder head.
• valve stem end
(with an oil stone)
• valve stem 1
• valve stem seal 2
(with the recommended lubricant)
Recommended lubricant
Molybdenum disulfide oil
• valve 1
• lower spring seat 2
• valve stem seal 3
• valve spring 4
• upper spring seat 5
(into the cylinder head)
ENG