Table of Contents
Advertisement
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
open
ing
more
and
more, slowly
iso lating
the spark
p!ug
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 pl
ug,
the cylinder
head
may be damaged.
On the
other hand,
using
a spark
plug
longer
than necessary (Figure
No.
3) may:
A)
Hit the
p iston
, breaking
it or the
spark
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
motorcycle.
If you
prefer
another brand
of
spark
plugs,
be careful that
the
type used
is
THE
EXACT
EQUIVALENT
of
Champion
recom-
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
inside
of the engine.
The
internal adjustment
of
the carburetor
shou!d be
done
by
a
me-
ch
anic.
Below
we
give
some
su
ggestions
for
the
external
adjustment
of
the carburetor.
Advertisement
Table of Contents
