Wen GN4500 Instruction Manual page 23

INSPECTING/CLEANING THE SPARK ARRESTOR
Inspect and clean the spark arrestor every 100 hours of
operation (refer to page 20, Table 4). The spark arrestor
is located outside the muffler, which gets very hot during
operation. Allow the engine to cool completely before ser-
vicing the spark arrestor.
1. Remove the screw/clamp that secures the spark arrestor
to the muffler. See Fig. 12.
2. Remove the spark arrestor screen.
3. Carefully clean and remove the carbon deposits from the
spark arrestor screen with a wire brush. Replace the spark
arrestor if it is damaged. Replacement spark arrestors can
be purchased from wenproducts.com by searching the
part number GN4500-026.1.
4. Reinstall the spark arrestor in the muffler and secure it in
place with the screws.
SPARK PLUG MAINTENANCE
Inspect and change the spark plug every 100 hours of
operation (refer to page 20, Table 4). The spark plug
is important for proper engine operation. Check the spark
plug regularly to maintain proper engine operation. A good
spark plug should be intact, free of deposits, and properly
gapped.
1. Gently pull on the spark plug boot to remove it. Be care-
ful not to tear insulation or wire. See Fig. 13.
2. Use the included spark plug wrench (Fig. 14) to unscrew
the spark plug from the engine. Remove the spark plug
from the engine. TIP: There is limited space for the wrench
to turn. Use both rows of holes in the spark plug wrench to
gain leverage to loosen the plug.
3. Visually inspect the spark plug. If it is cracked or chipped,
or if the electrodes are worn or burned, discard it and re-
place with a new spark plug. We recommend replacing it
with an NGK BP7ES/Torch F7TC spark plug. These can be
purchased from wenproducts.com by searching part num-
ber DF475-145.
4. If re-using the spark plug, use a wire brush to clean any
dirt from around the spark plug base, then re-gap the spark
plug.
Instructions continue on the next page.
MAINTENANCE
Cylinder Assembly
Spark Arrestor
Spark Plug Boot
Handle (1) Wrench (1)
Fig. 12
Muffler
Fig. 13
Fig. 14
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