143
POWERHEAD
CYLINDER HEAD
7
Valve Spring
Measure valve spring free length. If measurement
is lower than service limit, replace valve spring.
• Standard: 1.608 in. (40.84 mm)
• Service limit: 1.5487 in. (39.21 mm)
Measure valve spring tension. If measurement is
lower than service limit, replace valve spring.
• Standard: 24.5 to 28.2 lbs. (111 to 128 N) for
1.24 in. (31.5 mm)
• Service limit: 22.5 lbs. (102 N) for 1.24 in. (31.5
mm)
Assembly
Valve Guide Replacement
IMPORTANT:
Be careful not to damage cylinder
head when replacing valve guide.
Drive valve guide out toward valve spring side.
IMPORTANT: Do not reuse valve guide once it
has been removed. Always use a new valve guide
(oversize) when assembling.
Ream valve guide hole with 10.5 mm reamer to
true hole and remove burrs. Turn reamer clock-
wise, never counterclockwise.
004541
004542
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005684
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