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Carburetor Adjustment - Zenith
The idle speed adjustment screw, and
the idle fuel mixture adjustment needle
are accessible on the exterior of the
carburetor.
There are three factors that control
conversion of the fuel and air mixture
into the engine power. These factors
are engine compression, ignition and
correct carburetor air/fuel adjustment.
Correct carburetor adjustment cannot
be obtained, however, unless engine
compression and ignition meet
specifications.
To make the adjustments, start the engine and operate it until it has reached
normal operating temperature. Be sure the choke and throttle controls are pushed
all the way in.
Start the adjustments by setting the idle speed screw to obtain an engine speed of
750 rpm. Then turn the idle fuel mixture adjustment needle in (clockwise) until the
engine begins to roll. Then, back it out slowly until the engine is running smoothly.
Reset the idle speed to 750 rpm.
Fuel Filter at Carburetor
The disposable filter is located at the carburetor fuel inlet line.
1. Backup filter using an 11/16” open end wrench while removing fuel inlet line
using a 1/2” line wrench.
CAUTION: Do not use open end wrench on a fuel line fitting. This may cause
damage to the fitting.
2. Unscrew fuel filter from carburetor and discard.
3. Install new filter being careful not to overtighten.
4. Backup filter while tightening inlet line.
5. Cycle ignition switch and check for leaks.
Fuel Filter Before Fuel Pump
The disposable filter is located on the inlet side of the electric fuel pump.
1. Backup filter using an open end wrench while removing fuel inlet line using a
line wrench.
2. Disconnect hose clamp and remove filter from hose and discard.
3. Install new filter being careful not to overtighten.
4. Backup filter while tightening line.
5. Cycle ignition switch and check for leaks.
Idle Speed
Adjusting Screw
Idle Mixture
Adjusting Screw
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