Apico Dellorto Carburettor Air Screw - Red
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Product Information
Full details
The Apico Dellorto Carburettor Air Screw is an essential upgrade for off-road enthusiasts and mechanics looking to simplify fuel-air mixture tuning on Dellorto carburetors. Designed for precision and ease of use, this component allows for rapid adjustments without the need for specialized tools, though users should ensure their carburetor model is compatible before installation to avoid mixture imbalances.
All features
| Model Part Number | AT AIRSCREW DEL RD |
|---|---|
| Brand | Apico |
Extended Product Information
FAQs
Will this fit any carburetor?
No, this screw is specifically designed for Dellorto carburetors. Check your carburetor model before purchase.
Do I need to remove the carburetor to install it?
In most cases, you can install the screw with the carburetor mounted on the bike, provided there is enough physical clearance.
What is the function of the air screw?
It controls the amount of air allowed into the pilot circuit, which dictates the air-fuel ratio at idle and low throttle openings.
Should I use the original spring with the new screw?
It is recommended to use the spring included with the new screw, but if the kit does not include one, ensure your original spring is not compressed or damaged.
How do I know if the setting is correct?
Generally, you adjust the screw until the engine reaches the highest, smoothest idle speed, then back it off slightly to reach your target setting.
Troubleshooting
Screw is difficult to turn after installation
Ensure the screw is not cross-threaded and the O-ring is seated correctly without binding.
Idle speed fluctuates randomly
Check that the spring tension is sufficient to hold the screw in place; verify the O-ring is in good condition to prevent vacuum leaks.
Pros and Cons
Pros
- Eliminates the need for screwdrivers during trackside tuning
- High-quality construction from a trusted brand
- Easy to grip even while wearing riding gloves
- Sturdy design resists heat and vibration
Cons
- Specific to Dellorto carburetors; not a universal part
- Manual adjustment requires a good ear for engine idle changes
- Exposed screw head may be prone to dirt accumulation
Setup, Compatibility & Care
Installation is straightforward: ensure the engine is off and the engine is cool. Carefully unscrew the original adjustment screw, noting the position of the spring and any O-rings, then thread in the Apico unit. Do not overtighten, as this can damage the internal needle tip or the carburetor seat. To maintain the screw, occasionally wipe away debris from the threads and the adjustment knob to ensure smooth movement. Always verify that your carburetor is a genuine Dellorto model before purchasing this specific part.