C)
The
spark
plug is supported
by
very
few turns of screw thread,
which
may cause
insufficient pressure (causing leaks)
or
dam-
age to the screw thread
of
the
cylinder
head
when tightening too much
on
very few turns
of
screw thread.
D) Cinder
co
llects on the free part
of
the
thread,
which
closes the threaded opening
more and more, slowly isolating the spark
p
!u
g spark. The
cinder
collected on the
th
read so hard that when the attempt is made
to remove it
or
to insert a longer spark plug,
the cylinder head
may
be damaged.
On the other hand, using a spark plug
longer
than necessary (Figure No.
3)
may:
A) Hit the piston, breaking it
or
the
spa
rk
plug.
B)
When the
spark
nears the piston, the
heat may melt it making a perforation.
In
either of these two cases the fragments re-
sulting from the
damage
may cause great
upsets if they fall into the crankcase
or
are
trapped between the
piston
and the cylinder.
For
this
reason,
be
sure that the
spark
plug you use is
of
the exact measurements
and the thermic nature
recommended
by the
factory
for
your
motorcyc
le.
If you
prefer
another
brand of
spark
plugs, be careful that the type used is THE
EXACT EQUIVALENT
of
Champion
reco
m-
mended. (Any auto parts
shop
can
supply
you with a chart
of
equivalents of all brands
of
spark
plugs.)
CARBURETOR
ADJUSTMENT
The carburetor is a vitally important part,
since it regulates the passage
of
fuel to the
insi
de
of
the engine. The internal adjustment
of
the carburetor shou!d be
do
ne by a me-
chanic. Below we give some
su
ggestions for
the external adjustment of the carburetor.
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