Curtis Dyna-Fog BLACKHAWK 2620, Instruction Manual

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Carburetor – Pump Chamber Side
CARBURETOR ADJUSTMENT
NOTE
If clean fresh gasoline with Dyna-Fog
®
Fuel Stabilizer additive is used, the Carburetor will
almost never require servicing. Usually most operational problems involve carbon build-up, weak
spark, or excessive priming, causing the engine to flood. All of these possibilities should be checked
before working on the Carburetor.
An out of adjustment Carburetor will cause the following symptoms. Note that all of these
can also be caused by a weak battery and/or carbon build-up.
Symptom: #1
Machine is hard to start (too much gasoline).
Cause:
1. Inlet Needle Valve wedged open.
2. Fuel Needle set too far open.
3. Metering Lever set too far out.
Symptom: #2
Machine is hard to start (not enough gasoline).
Cause:
1. Carburetor is clogged.
2. Fuel needle stuck to its seat.
3. Metering lever set too far in.
Symptom: #3
Machine runs, but dies when beginning to fog.
Cause:
Fuel-air mixture is too lean or too rich.
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