CHOKE ADJUSTMENT
Hard starting condition?Adjust by bending the choke rod at (a).
How To Adjust a Weber Marine Choke Integral (mounted on the carb) Type?
Here’s a clear step-by-step guide for adjusting the integral choke on a Weber marine carburetor. This applies to most Weber marine units with the round, integral electric or hot-air choke housing mounted on the carb body.
1. Safety First
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Make sure the engine is off and cool before beginning.
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Disconnect the battery if you’ll be working near electrical connections.
2. Identify the Choke Housing
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The integral choke is a round black or metal housing mounted to the carburetor body.
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It’s held on by three retaining screws that allow for rotation/adjustment.
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A coil spring inside the housing moves the choke plate as it heats up.
3. Mark the Factory Position
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Before making changes, use a marker or scribe to note the current alignment of the choke housing to the carb body.
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This gives you a reference point to return to if needed.
4. Adjustment Procedure
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Loosen the three screws just enough that the choke housing can rotate, but do not remove them.
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Rotate the housing:
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Clockwise (tighten spring): Makes the choke plate close more — richer setting, longer warm-up.
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Counterclockwise (loosen spring): Makes the choke plate open sooner — leaner setting, shorter warm-up.
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Set the choke so that, when cold:
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The choke plate just closes fully when you open and release the throttle slightly.
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It should not bind or force itself hard shut.
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5. Warm-Up Check
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Start the engine cold.
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The choke plate should begin to open within 30–60 seconds as the element heats.
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After a few minutes, the choke should be fully open.
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If the engine stumbles rich when warming up ? rotate housing counterclockwise.
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If the engine stalls lean or won’t start cold ? rotate housing clockwise.
7. Fine Tuning
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It may take 1–2 small adjustments to get the balance right for your specific marine engine and climate.
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Always make adjustments in small increments (about 1/16” to 1/8” of a turn on the housing).
Summary:
To adjust the Weber marine integral choke: loosen the housing screws, rotate the choke housing slightly to change spring tension, verify cold closure and proper warm-up opening, then fine-tune for smooth cold starting without flooding or stalling.
