84
POWERHEAD
CYLINDER HEAD
Measure the valve seat contact width.
Valve seat contact width:
• IN / EX: 0.03 to 0.04 in. (0.8 to 1.0 mm)
If measurement exceeds specification, repair
valve seat.
Clean and assemble the cylinder head and valve
components.
IMPORTANT: Fill the intake and the exhaust
ports with solvent in order to check for leaks
between the valve seat and the valve.
If any leaks occur, inspect the valve seat and the
face for burrs or debris which could prevent the
valve from sealing.
Valve Spring
Measure the valve spring free length.
Valve spring free length:
• Standard – IN / EX: 0.883 in. (22.42 mm)
• Service limit – IN / EX: 0.847 in. (21.52 mm)
If the measurement exceeds the service limit,
replace the valve spring.
Valve Spring Preload
Measure the valve spring preload.
Valve spring preload:
• Standard – IN / EX: 8.05 to 9.24 lbs. (3.65 to
4.19 kg) for 0.6 in. (15 mm)
• Service limit – IN / EX: 7.34 lbs. (3.3 kg) for 0.6
in. (15 mm)
If the measurement exceeds the service limit,
replace the valve spring.
Assembly
Assembly is reverse order of disassembly with
special attention to the following steps.
Apply engine oil to the valve stem seals.
Install the valve stem seals to the valve guide.
IMPORTANT: Do not re-use the removed valve
stem seal. Always use a new stem seal.
1. Valve seat contact area 006045
006047
1
006048
1. Valve stem seal (2) 006049
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