Checking The Valve Lifters; Installing The Valves And Valve Springs - Yamaha YFZ450S 2003 Service Manual

VALVES AND VALVE SPRINGS
12.Measure:
EAS00242

CHECKING THE VALVE LIFTERS

The following procedure applies to all of the
valve lifters.
1. Check:
EBS00241
INSTALLING THE VALVES AND VALVE
SPRINGS
1. Apply:
2. Install:
NOTE:
_
Install the valve springs with the larger pitch a
facing upwards.
b Smaller pitch
4 - 32
• valve spring tilt a
Out of specification → Replace.
Valve spring tilt limit
Intake
2.5°/1.61 mm (0.063 in)
Exhaust
2.5°/1.65 mm (0.065 in)
• valve lifter
Damage/scratches → Replace the valve lift-
ers and cylinder head.
• molybdenum disulfide oil
(onto the valve stem and valve stem seal)
• valves
• lower valve spring seats
• valve stem seals
• valve springs
• upper valve spring seats
ENG
New