8.
Carburetor Adjustment
Carburetor settings should
be
determined according
to
the burning
condition
of
the spark plug. Generally speaking, a motocrosser
is
run
with
full-throttle,
and
therefore, the carubertor main jet greatly
affects the performance
of
the engine.
•
When
the
spark
plug
is
in a tan color:
Best.
That
is,
the carburetor settings are the most suitable
for
the
condition
of
the racing circuit, weather, and operation.
•
When
the electrodes
are
white:
The spark plug
runs
too hot. In this
case,
the main
jet
should
be
replaced with a larger
one.
•
When
the electrodes
are
sooty
and
oily:
If
the electrodes
are
sooty
and
oily,
the main
jet
should
be
re-
placed with a smaller
one.
*
The
larger the main jet calibration No., the more the gasoline
is
supplied. The calibration
Nos.
are
designated
as
follows:
Up to No.100 . . . . . Calibrated by 5
Over
No.100
......
Calibrated by 10
After
replacing the main jet, check the engine operating con-
dition in the following manner. Rapidly open the
throttle
valve,
and
observe
the
increase
of
the engine
speed.
If
the
speed
will
• I
not
increase
smoothly, showing irregularity, the position
of
the
jet needle must
be
changed.
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