The accelerator pump is a vital component in a Weber carburetor that aids in smooth throttle response and prevents hesitation during acceleration. Here's a step-by-step guide on adjusting the accelerator pump:
1. Locate the Accelerator Pump:
The accelerator pump is typically located on the side or bottom of the carburetor body. It is connected to the throttle linkage and usually consists of a piston and a spring.
2. Remove the Air Filter Assembly:
For better access, remove the air filter assembly or housing from the carburetor.
3. Disconnect the Throttle Linkage:
Disconnect the throttle linkage from the accelerator pump lever. This will allow you to move the pump lever freely.
4. Check the Pump Lever:
Gently move the accelerator pump lever by hand. It should move smoothly without any binding or excessive resistance.
5. Adjust the Pump Stroke:
The pump stroke determines the amount of fuel delivered by the accelerator pump. If the stroke is too short, it may not provide enough fuel, resulting in hesitation; if it's too long, it can cause flooding.
To adjust the pump stroke, loosen the lock nut or screw on the accelerator pump lever. Turn the adjusting screw to increase (longer stroke) or decrease (shorter stroke) the pump stroke as needed.
6. Check the Pump Jet:
Make sure the accelerator pump jet is clean and free from any obstructions. A clogged jet can affect fuel delivery and cause issues during acceleration.
7. Re-attach the Throttle Linkage:
Reconnect the throttle linkage to the accelerator pump lever, ensuring it moves freely.
8. Test the Adjustment:
Start the engine and allow it to warm up to its normal operating temperature. Gently press the accelerator pedal a few times to observe the response. If the adjustment is correct, there should be no hesitation during acceleration.
Remember, adjusting the accelerator pump is crucial for proper engine performance and throttle response. If you're unsure about making these adjustments yourself, it's recommended to consult with a qualified mechanic or refer to the specific carburetor manual for detailed instructions.
