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HW4000 Portable Generator Owner’s Manual www.honeywellgenerators.com 25
Cleaning Spark Arrestor Screen
3.
Remove spark plug cap.
4. Clean any dirt from around spark plug base.
5. Carefully pull off spark plug cap.
6. Using a 13/16” spark plug socket wrench, loosen and
remove spark plug.
7. 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.
8. If reusing spark plug, clean spark plug with wire
brush.
9. Measure spark plug gap with wire feeler gauge.
Gap should be: (0.028-0.031 in) (0.70-0.80 mm).
10. If necessary, adjust gap by carefully bending side
electrode.
11. Inspect spark plug washer and verify it is in good con-
dition.
12. Reinstall spark plug by hand to prevent cross-thread-
ing.
13. 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 (Table2) to ensure prevention of sparks escaping
generator.
1. Stop generator if engine is running. Allow to com-
pletely cool.
2. Be sure generator is set on flat, level surface.
3. Using a socket wrench with 8 mm socket, remove
spark arrestor enclosure panel bolts.
FIGURE 32: Spark Plug Cap Removal
FIGURE 33: Spark Plug Removal
FIGURE 34: Correct Spark Plug Gap
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.
Muffler reaches temperatures that can cause serious
burns if touched. NEVER touch hot surfaces.
To clean spark arrestor screen, you will need:
Socket wrench with 8 mm socket
Phillips head screwdriver
Wire brush
FIGURE 35: Remove Spark Arrestor Enclosure Panel