TOHATSU M 4C Owner's Manual page 53

gap to specification.
1. Stop the engine.
2. Remove the top cowl.
3. Remove the spark plug cap.
4. Remove the spark plug by turning it
counter-clockwise, using a 13/16" (21
mm) socket wrench and handle that is
provided in tool bag.
5. Inspect the spark plug. Replace the
spark plug with wear on electrodes
and if the insulators are cracked or
chipped.
6. Measure the spark gap with a wire
type feeler gauge. The gap should be
0.9-1.0 mm (0.035-0.039 inches). If
the gap is different, replace the spark
plug with a new one
Use spark plug NGK BP7HS-10 or
BPR7HS-10.
1
2
1. Electrode
2. Spark gap (0.9–1.0 mm, 0.035–0.039 in)
7. Install the spark plug by hand and turn
it carefully to avoid cross-threading.
8. Tighten the spark plug to the speci-
fied torque.
ENON00028-1
Note
Spark plug tightening torque:
27 Nm (20.0 ft-lb) [2.7 kgf-m]
If a torque-wrench is not available when
you are installing a spark plug, tighten it 1/4
to 1/2 a turn past finger-tight. Have the
spark plug adjusted to the correct torque
as soon as possible with a torque-wrench.
ENOF00085-0
INSPECTION AND MAINTENANCE
53
ENOF02137-0
10