TOHATSU BFT250A - Assembly

14-28
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CYLINDER HEAD
ASSEMBLY
Install the valve stem seals.
Note that valve stem seal A (intake side) and B
(exhaust side) are different. Do not confuse them.
Install the valve spring seat.
Apply engine oil to the new valve stem seal [1] inner
surface.
Install the new valve stem seals using the special tool.
• Use the 5.5 mm side of special tool.
Install the valve spring [1] and valve spring retainer.
• Install the valve spring with its narrow pitched side
[2] facing the valve spring seat and painted side [3]
facing the retainer.
• Do not confuse the intake valve spring with the
exhaust valve spring.
Using the special tools, compress the valve spring and
set the two valve keepers in the groove in the valve
stems securely.
INTAKE STEM
SEAL A
SPRING (WHITE)
INTAKE STEM
SEAL B
SPRING (BLACK)
TOOL:
Stem seal driver [2] 07PAD-0010000
[2]
[1]
[2]
TOOL:
Valve spring compressor [4] 07757-0010000
[4]
[1]
[3]
[2]