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Cleaning Spark Arrestor Screen
24 www.honeywellgenerators.com HW4000/HW4000L Portable Electrical Generator Owner’s Manual
6. Inspect spark plug.
If spark plug is damaged or excessively worn, or if
insulator is cracked or chipped, use a new spark
plug.
If spark plug is in good condition, reuse existing
spark plug.
7. If reusing spark plug, clean spark plug with wire
brush.
8. Measure spark plug gap with spark plug gauge.
Gap should be: (0.028-0.031 in) (0.70-0.80 mm).
9. If necessary, adjust gap by carefully bending side
electrode.
10. Inspect spark plug washer and verify it is in good con-
dition.
11. Reinstall spark plug by hand to prevent cross-thread-
ing.
12. After spark plug is seated, tighten with spark plug
wrench to compress washer.
If installing a new spark plug, tighten l/2 turn after
the spark plug seats to compress the washer.
If reinstalling a used spark plug, tighten l/8 - l/4 turn
after the spark plug seats to compress the washer.
Cleaning Spark Arrestor Screen
Generator muffler is equipped with spark arrestor screen,
which must be cleaned according to maintenance sched-
ule (Table 2).
1. Stop generator if engine is running. Allow to com-
pletely cool.
2. Place the generator on a flat, level surface.
3. Using a socket wrench with 8 mm socket, remove
spark arrestor enclosure panel bolts.
4. Pull off enclosure panel.
5. Using a screwdriver, loosen and remove screw hold-
ing spark arrestor clamp (A).
6. Slide off spark arrestor clamp.
7. Using a socket wrench with a 7/32” socket, remove
the retaining screw on spark arrestor screen cap (B);
pull off cap.
8. Pull out spark arrestor screen (C).
FIGURE 48: Correct Spark Plug Gap
NOTICE
Spark plug must be securely tightened. An improperly tight-
ened spark plug can become very hot and could damage
engine. Never use spark plugs that have an improper heat
range. Use only recommended spark plugs or equivalent.
0.028-0.031 in
(0.70-0.80 mm)
Muffler reaches temperatures that can cause serious
burns if touched. NEVER touch hot surfaces.
To clean spark arrestor screen, you will need:
1/4” socket wrench
8 mm socket
7/32” socket
#2 Phillips screwdriver
Wire brush
FIGURE 49: Remove Spark Arrestor Enclosure Panel
FIGURE 50: Spark Arrestor Assembly
WARNING
A
B
C