Honda BF40D Manual page 134

CYLINDER HEAD REASSEMBLY
1) Apply molybdenum disulfide oil to the valve stem sliding
surface, and insert the valve into the valve guide.
1
Check that the valve moves up and down smoothly.
2
• Do not confuse the intake valve with the exhaust valve on
reassembly.
3
4
Valve O.D.
5
2) Install the valve spring seat on the cylinder head.
6
Apply engine oil to the inner wall of a new valve stem seal,
and install it on the valve guide.
7
8
9
10
11
12
3) Set the valve spring, and install the valve spring retainer.
13
• Do not confuse the intake valve spring with the exhaust
14
valve spring.
15
Installation direction:
Install the valve spring with the painted side toward the
16 valve spring retainer, and with the narrow pitch side of the
coil toward the valve spring seat.
17
18
19
20
9-24
32.90 - 33.10 mm
IN
(1.295 - 1.303 in)
28.90 - 29.10 mm
EX
(1.138 - 1.146 in)
134
[1]
VALVE SPRING
SEAT
[3]
[4]
MOLYBDENUM
VALVE DISULFIDE OIL
[1]
VALVE
SPRING
[4]
VALVE SPRING
[1]
RETAINER
VALVE
SPRING
[2]
VALVE STEM
SEAL
[2]
PAINT
[3]
NARROW
PITCH OF COIL