Checking The Valve Springs - Yamaha FZ1-N 2007 Service Manual

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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.
Valve spring free length
Intake valve spring
40.5 mm (1.60 in)
Limit
38.5 mm (1.47 in)
Exhaust valve spring
40.5 mm (1.60 in)
Limit
38.5 mm (1.47 in)
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VALVES AND VALVE SPRINGS
2. Measure:
• Compressed valve spring force "a"
Out of specification → Replace the valve
spring.
Compressed valve spring force
(installed)
Intake valve spring
127.4–144.6 N (12.99–14.74 kg,
28.64–32.51 lb) at 32.65 mm
(1.285 in)
Exhaust valve spring
133.0–153.0 N (13.56–15.60 kg,
29.90–34.39 lb) at 32.82 mm
(1.292 in)
b. Installed length
3. Measure:
• Valve spring tilt "a"
Out of specification → Replace the valve
spring.
Spring tilt limit
Intake valve spring
1.8 mm (0.07 in)
Exhaust valve spring
1.8 mm (0.07 in)
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