2
15
8. Install air filter cartridge into air cleaner base.
9. Install air cleaner cover onto air cleaner base. Move
latch to lock cover.
10. Install duckbill air valve on air inlet port of air cleaner
cover. Replace duckbill air valve if damaged or
missing.
IMPORTANT NOTE:
Engine operation without the
duckbill air valve can reduce filter efficiency by as
much as 50 percent.
10
Clean/Gap/Replace Spark Plug
NOTE:
Spark plugs have different thread lengths and
heat ranges. Always use the specified replacement spark
plug or engine damage can occur.
1. Remove spark plug wire from spark plug terminal.
2. Thoroughly clean area around spark plug to keep dirt
and debris out of combustion chamber.
3. Remove spark plug from cylinder head using the 5/8
inch Spark Plug Wrench (Part No. 19576S).
4. Check condition of threads in cylinder head. If
necessary, soften deposits with penetrating oil and
clean out with a thread chaser.
5. Clean spark plug using a wire brush and commercial
solvent. Do not bead blast spark plug. Obtain
new
spark plug if electrode is pitted or burned, or if
porcelain is cracked.
6. See Figure 11. Using a feeler gauge, verify spark
plug gap is
0.030 inches
(0.76 mm). If necessary,
adjust gap by carefully bending ground electrode.
7. Finger tighten spark plug into cylinder head, and then
tighten to
140-200 lb-in
(15.8-22.6 N-m).
8. Install spark plug wire onto spark plug terminal.
11
Clean/Replace In-Tank Fuel Filter
1. Start and run engine until fuel tank is empty.
2. Remove spark plug wire from spark plug terminal.
Secure spark plug wire to prevent unintentional
contact with spark plug terminal.
3. See Figure 12. Remove hex flange nut (
A
) to release
trim panel (
B
) from inside carburetor mounting stud.
4. Remove hex flange screw (
C
) to release trim panel
and air cleaner base (
D
) from control bracket.
5. Remove breather hose (
E
) from port on air cleaner
base.
6. Remove two hex flange nuts (
F
) to release air cleaner
base from carburetor mounting studs.
7. See Figure 13. Remove two hex flange nuts (
A
) from
fuel tank studs.
8. On opposite side of fuel tank, remove hex flange
screw (
B
) to release fuel tank (
C
) from crankcase
flange.
NOTE:
For best access to screw, move throttle
control lever left to the FAST position and use a 8 mm
socket with extension.
NOTE:
Exercise care to avoid dropping screw
between engine and blower housing. A dropped
screw may be caught by the flywheel magnet where
further disassembly would be required to retrieve it.
9. Raise and remove fuel tank.
10. If equipped, remove key switch panel (
D
) from fuel
tank studs.
11. Squeeze tangs and move hose clamp (
E
) away from
fuel filter fitting.
12. Remove hose (
F1
or
F2
) from fuel filter fitting. For
best results, use Fuel Hose Remover (Part No.
19620) (
G
).
NOTE:
Hose (
F2
) is only used on models equipped
with the optional fuel pump.
13. Using hex, remove fuel filter fitting (
H
) from fuel tank.
Not for
Reproduction
Summary of Contents for Vanguard 10V300
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