CHECKING THE SPARK PLUG
• Spark plug
• Electrode "1"
• Insulator color "2"
Normal condition is a medium to
light tan color.
Distinctly different color
the engine condition.
When the engine runs for many hours
at low speeds, the spark plug insula-
tor will become sooty, even if the en-
gine and carburetor are in good
• Plug gap "a"
Use a wire gauge or thickness
Out of specification
Spark plug gap:
0.7–0.8 mm (0.028–
4. Clean the plug with a spark plug
cleaner if necessary.
• Spark plug
13 Nm (1.3 m•kg, 9.4
• Before installing a spark plug, clean
the gasket surface and plug sur-
• Finger-tighten "a" the spark plug
before torquing to specification "b".
CHECKING THE IGNITION TIMING
• Timing mark accessing screw "1"
• Timing light
• Inductive tachometer
To the ignition coil lead (orange
• Engine idling speed
Refer to "ADJUSTING THE EN-
GINE IDLING SPEED" section.
• Ignition timing
Visually check the stationary
pointer "a" is within the firing
range "b" on the rotor.
Incorrect firing range
tor and pickup assembly.
• Timing mark accessing screw
CHECKING AND CHARGING THE
Batteries generate explosive hy-
drogen gas and contain electrolyte
which is made of poisonous and
highly caustic sulfuric acid. There-
fore, always follow these preven-
• Wear protective eye gear when
handling or working near batter-
• Charge batteries in a well-venti-
• Keep batteries away from fire,
sparks or open flames (e.g.,
welding equipment, lighted ciga-
• DO NOT SMOKE when charging
or handling batteries.
• KEEP BATTERIES AND ELEC-
TROLYTE OUT OF REACH OF
• Avoid bodily contact with elec-
trolyte as it can cause severe
burns or permanent eye injury.
FIRST AID IN CASE OF BODILY
• Skin — Wash with water.
• Eyes — Flush with water for 15
minutes and get immediate med-
• Drink large quantities of water or
milk followed with milk of magne-
sia, beaten egg or vegetable oil.
Get immediate medical attention.
Charging time, charging amperage
and charging voltage for an MF
battery are different from those of
conventional batteries. The MF
battery should be charged as ex-
plained in the charging method il-
lustrations. If the battery is
overcharged, the electrolyte level
will drop considerably. Therefore,
take special care when charging
Since MF batteries are sealed, it is
not possible to check the charge state
of the battery by measuring the spe-
cific gravity of the electrolyte. There-
fore, the charge of the battery has to
be checked by measuring the voltage
at the battery terminals.
• Battery leads
(from the battery terminals)
First, disconnect the negative bat-
tery lead "1", and then the positive
battery lead "2".