Checking The Valve Springs; Checking The Valve Lifters; Installing The Valves - Yamaha 2009 XP500Y TMAX Service Manual

j. Measure the valve seat width again. If the
valve seat width is out of specification, reface
and lap the valve seat.
L LLL L LLL L L LLL L L LLL L
EAS24310

CHECKING THE VALVE SPRINGS

The following procedure applies to all of the
valve springs.
1. Measure:
• Valve spring free length "a"
Out of specification → Replace the valve
spring.
Free length (intake)
35.59 mm (1.40 in)
Limit
33.81 mm (1.33 in)
Free length (exhaust)
35.59 mm (1.40 in)
Limit
33.81 mm (1.33 in)
2. Measure:
• Compressed valve spring force "a"
Out of specification → Replace the valve
spring.
Installed compression spring
force (intake)
91.2–104.9 N (20.50–23.59 lbf)
(9.3–10.7 kgf)
Installed compression spring
force (exhaust)
91.2–104.9 N (20.50–23.59 lbf)
(9.3–10.7 kgf)
Installed length (intake)
30.39 mm (1.20 in)
Installed length (exhaust)
30.39 mm (1.20 in)
L LLL L L LLL L LLL
5-23
VALVES AND VALVE SPRINGS
b. Installed length
3. Measure:
• Valve spring tilt "a"
Out of specification → Replace the valve
spring.
Spring tilt (intake)
2.5°/1.6 mm
Spring tilt (exhaust)
2.5°/1.6 mm
EAS24320

CHECKING THE VALVE LIFTERS

The following procedure applies to all of the
valve lifters.
1. Check:
• Valve lifter
Damage/scratches → Replace the valve lift-
ers and cylinder head.
EAS24340

INSTALLING THE VALVES

The following procedure applies to all of the
valves and related components.