ADJUSTMENTS
CHECK BREAKER POINTS
Replace burned
or
faulty points. If only slightly
burned, dress smooth with file
or
fine stone. Measure
gap with thickness gauge, Figure
15.
1.
The centrifugal switch is wide open when eng ine
is stopped. Loosen and move stationary contact
to correct gap.
2.
Ignition breaker pOints must be correctly gapped.
Crank engine to fully open breaker pOints (1/4
turn after top center). Loosen and move
stationary contact
to
correct the gap at full
separation. Tighten contact and recheck gap.
Ignition points should break contact just when timing
mark aligns
for
degree
of
spark advance (or retard)
as
specified. Final timing
is
corrected by properly
rotating the breaker plate at its mounting and using a
timing light.
If
specified timing cannot beobtained by
rotati.on
of
the breaker plate, check to be
su
re
tim ing
marks on gears are aligned. Timing procedures
. appear
in
separate service manual.
CARBURETOR (Gasoline)
The carburetor (Figure
16)
has
amain
fuel (high
speed) adjustment(needle
A)
and
an
idle fuel adjust-
ment (needle B). Early models have the main adjust-
ment needle on the top
of
the carburetor. The main
adjustment (needle A) affects operation under heavy
load conditions. Idle adjustment affects operation at
light
or
no
load. Under normal circumstances, factory
carburetor adjustments should
not
be disturbed. If
the adjustments have been disturbed, turn needles
off
their seats 1 to 1-1/2 turns to permit starting, then
readjust them
for
smooth operation. .
IGNITION
BREAKER
POINTS
•
020'·'
FUEL
IDLE
ADJUSTMENT
B
THIS
DISTANCE
1/32
INCH
AT
NO
LOAD
MAIN
FUEL
PACKING
NUT
ADJUSTMENT
~
NYLO:
ROD
EXTENDING
DOWN
THROUGH LOWER
SHROUD
PAN.
FIGURE 16.. CARBURETOR ADJUSTMENTS
~
Loosen packing
nut
(Figure 16) before tur-
~
nlng main fuel adlustment and tighten
to
a
snug
fit
after adjustment has been made.
Hold
the adjustment while
tightening packing nut. This procedure
will
make
It
easier
to
use the .
carburetor adjusting tool (420-0169).
It
will
also prevent air entry
that causes
rough
engine operation and fuel leaks. The fuel leaks .
occur
when the engine Is not. running and cause
difficult
starting
because the float level Is lowered.
~
Forcing the needle against its seat will
~
damage It. The needle does
not
completely
shut
off
when turned fully in .
BEND
TAB
TO
ADJUST
ZENITH
CARBURETOR
,0.913
Rev
THIS
DIMENSI0I'o!.,
SHOU LD BE
1/8
(3.18 mm) FROM
GASKET
TO
FLOAT
BOWL
FLANGE
GASKET
FIGURE 15. BREAKER POINT ADJUSTMENT
FIGURE
17.
CARBURETOR FLOAT ADJUSTMENT
17
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