Spark Plug - Betamotor ALP4T 125 Bedienungsanleitung

SPARK PLUG

To avoid burns, put on pro-
tective gloves before perfor-
ming the operation.
Keeping the spark plug in good condi-
tion makes for reduced consumption and
optimum 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.
If the insulator appears white, the mixture
is probably too lean; conversely, a green
insulator denotes a rich mixture. The mixtu-
re is correct when the insulator is tan co-
loured.
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 elec-
trode.
Check that the insulator is not cracked
and that the electrodes are not corroded,
in which case the spark plug should be
immediately replaced.
Conduct the check by referring to the ta-
ble on page 142.
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 DR8 EA spark plugs.
135
3
GB