Checking The Valve Springs - Yamaha 2012 TMAX XP500A Service Manual

f. After every lapping procedure, be sure to
clean off all of the lapping compound from
the valve face and valve seat.
g. Apply Mechanic's blueing dye (Dykem) "b"
onto the valve face.
h. Install the valve into the cylinder head.
i. Press the valve through the valve guide
and onto the valve seat to make a clear
impression.
j. Measure the valve seat width "c" again. If
the valve seat width is out of specification,
reface and lap the valve seat.
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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)
36.73 mm (1.45 in)
Limit
34.89 mm (1.37 in)
Free length (exhaust)
36.73 mm (1.45 in)
Limit
34.89 mm (1.37 in)
VALVES AND VALVE SPRINGS
2. Measure:
• Compressed valve spring force "a"
Out of specification → Replace the valve
spring.
Installed compression spring
force (intake)
96.6–111.2 N (9.85–11.34 kgf,
21.72–25.00 lbf)
Installed compression spring
force (exhaust)
96.6–111.2 N (9.85–11.34 kgf,
21.72–25.00 lbf)
Installed length (intake)
30.60 mm (1.20 in)
Installed length (exhaust)
30.60 mm (1.20 in)
b. Installed length
3. Measure:
• Valve spring tilt "a"
Out of specification → Replace the valve
spring.
Spring tilt (intake)
1.6 mm (0.06 in)
Spring tilt (exhaust)
1.6 mm (0.06 in)
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