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Sparking Plug.
The sparking plug is of great importance in
satisiactory engine performance, and every care
should be taken to fit the correct type when re-
placements are necessary.
This is Champion Type
N7, as illustrated in Fig. 12.
Remove the sparking plug every 1,000 miles for
inspection.
If the carburation system is in correct
adjustment the sparking plug points should remain
clean. almoSt indefinitely
An over-rich mixture
from the carburetter will, however, cause the for—
mation of a sooty deposit on the points and. later.
on the plug and face (as upper view, Fig. 12).
H
therefore such a deposit is found, clean it off care
fully and check your carburetter.
Too high a
proportion of oil in the petroil mixture will also
cause plug fouling (see page 12).
m 1.... 1'3;
Anmv "...-.-
Fig. 13.
Sparking plug gauge.
A light deposit due to any of these causes an
easily be cleaned oil, but if it is allowed to accumu-
late, particularly inside the body, the plug may
spark internally with an adverse effect on. the
30
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