10
Spark Plug Service
Recommended Spark Plug: NGK - BPR6ES
NOTICE
Incorrect spark plugs can cause engine damage.
For good performance, the spark plug must be properly gapped and
free of deposits.
Allow the engine to cool before servicing the spark plug.
1. Disconnect the spark
plug cap and remove
any dirt from around
the spark plug area.
2. Use a 13/16 in
(21 mm) spark plug
wrench to remove the
spark plug.
3. Visually inspect the
spark plug. Discard it if
the insulator is
cracked, chipped, or
fouled.
4. Measure the plug gap
with a suitable gauge.
Correct as necessary
by carefully bending
the side electrode.
Plug gap:
0.028 ~ 0.031 in
(0.70 ~ 0.80 mm)
5. Check that the spark
plug washer is in good
condition, and thread the
spark plug in by hand to
prevent cross-threading.
6. After the spark plug is
seated, tighten with a
spark plug wrench to
compress the washer.
If installing a new spark plug, tighten 1/2 turn after the spark plug
seats to compress the washer.
If reinstalling a used spark plug, tighten 1/8 - 1/4 turn after the
spark plug seats to compress the washer.
NOTICE
A loose spark plug can overheat and damage the engine.
Overtightening the spark plug can damage the threads in the
cylinder head.
7. Reconnect the spark plug cap.
Spark Arrester (optional equipment)
Your pump engine is not factory-equipped with a spark arrester. In
some areas, it is illegal to operate an engine without a spark arrester.
Check local laws and regulations. An optional USDA approved spark
arrester is available from an authorized Honda servicing dealer. See
page 20 for part numbers.
The spark arrester must be serviced every 100 hours to keep it
functioning as designed.
1. Allow the engine to cool, then remove the two 8 mm nuts and
remove the muffler from the cylinder head.
2. Remove the four 5 mm screws from the muffler protector and
remove the muffler protector.
3. Remove the 4 mm screw from the spark arrester and remove the
spark arrester from the muffler.
4. Use a stiff brush to remove
carbon deposits from the spark
arrester screen. Be careful not
to damage the spark arrester
screen.
5. Inspect the spark arrester for
breaks and holes. Replace it if
necessary.
6. Install the spark arrester and the
muffler in the reverse order of
disassembly.
Carburetor Adjustment
1. Start the engine
outdoors and let it warm
up to normal operating
temperature.
2. Move the throttle lever
to the idle position
(page 6).
3. Using a screwdriver,
turn the throttle stop
screw to obtain the
standard idle speed.
Standard Idle Speed:
1,400 rpm
SPARK PLUG WRENCH
SPARK PLUG CAP
0.028 ~ 0.031 in
(0.70 ~ 0.80 mm)
SEALING
WASHER
MUFFLER
PROTECTOR
8 mm NUT (2)
SPARK
ARRESTER
4 mm SCREW
5 mm SCREW (4)
MUFFLER
SPARK ARRESTER SCREEN
THROTTLE STOP SCREW
+200
-150