HONDA FG100 - Manual (Page 24)

Spark Plug Service
Recommended spark plugs:
NGK – C5HSB or CR5HSB
DENSO – U16FS-UB or U16FSR-UB
NOTICE
Incorrect spark plugs can cause engine damage.
1. Disconnect the spark plug cap, and remove any
dirt from around the spark plug area.
2. Remove the spark plug with a 5/8-inch spark
plug wrench.
3. Inspect the spark plug. Replace it if the
electrodes are worn, or if the insulator is
cracked or chipped. Clean the spark plug with a
wire brush if you are going to reuse it.
4. Measure the spark plug electrode gap with a
suitable gauge.
Plug gap: 0.024 - 0.028 in (0.60 - 0.70 mm)
Correct the gap, if necessary, by carefully
bending the side electrode.
5. Make sure the sealing washer is attached and
install the spark plug carefully, by hand, to
avoid cross-threading.
6. After the spark plug seats, tighten with a
5/8-inch spark plug wrench to compress the
washer.
If reinstalling the used spark plug, tighten
1/8 - 1/4 turn after the spark plug seats.
If installing a new spark plug, tighten 1/2 turn
after the spark plug seats.
NOTICE
A loose spark plug can overheat and damage
the engine. Overtightening the spark plug can
damage the threads in the cylinder head.
7. Attach the spark plug cap.
SPARK PLUG
SPARK PLUG WRENCH
SPARK PLUG CAP
0.024 - 0.028 in
(0.60 - 0.70 mm)
SIDE
ELECTRODE
SEALING
WASHER
MAINTENANCE & ADJUSTMENTS
22
FG100 TILLER