Spark Plug - Betamotor ALP 4.0 Bedienungsanleitung

3

SPARK PLUG

Keeping the spark plug in good condition
makes for reduced consumption and opti-
mum engine performance.
It is advisable to remove the spark plug
when the engine is hot (and naturally off)
because the carbon formation and the
colour of the insulator provide important
information on carburetion, lubrication, and
the general condition of the engine.
To carry out the check, simply remove the
current cap and then unscrew the spark
plug using the spanner provided.
Carefully clean the electrodes using a wire
brush. Blow the spark plug with com-
pressed air to prevent any residues from
getting into the engine.
Measure the spark gap with a thickness
gauge. The gap should be 0.6-0.7 mm. If
the gap is not as specified, restore the
proper gap by bending the earth electrode.
Check that the insulator is not cracked and
that the electrodes are not corroded, in
which case the spark plug should be im-
mediately replaced.
Conduct the check by referring to the ta-
ble on page 141.
Lubricate the spark plug thread, and then
(when the engine is cold) screw in the spark
plug by hand to its abutting end. Finally
tighten the spark plug with the spanner.
Note:
• Always use NGK CR9 EK - DENSO
U27ETR spark plugs.
GB
130