Checking The Valve Springs; Installing The Valves - Yamaha BT1100 2002 Service Manual

VALVE AND VALVE SPRINGS
EAS00241

CHECKING THE VALVE SPRINGS

The following procedure applies to all of the valve
springs.
1. Measure:
• valve spring free length a
Out of specification
Valve spring free length
(intake and exhaust)
44.6 mm
<Limit>: 43.5 mm
2. Measure:
• compressed spring force a
Out of specification
b Installed length
Compressed spring force
Intake and exhaust spring
3. Measure:
• valve spring tilt c
Out of specification
Spring tilt limit
Intake and exhaust valve spring
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
• oil seal New
(with the recommended lubricant)
Recommended lubricant
Molybdenum disulfide oil
3. Install:
• valve
• lower spring seat
• oil seal
New
• valve spring
• upper spring seat
(into the cylinder head)
4-26
ENG
Replace the valve spring.
Replace the valve spring.
160.7 N (16.4 kg) at 40 mm
Replace the valve spring.
2.5° / 1.9 mm