How to Adjust an Air Fuel Mixture Screw
Start the engine and let it run for 5 minutes to warm it up.. Locate the carburetor by finding the engine's air filter.. Find the flat-headed, slotted, gold-colored brass screw on the carburetor.
Steps
1
Start the engine and let it run for 5 minutes to warm it up.
Start the engine and let it run for 5 minutes to warm it up.
2
Locate the carburetor by finding the engine's air filter.
Locate the carburetor by finding the engine's air filter.
3
Find the flat-headed, slotted, gold-colored brass screw on the carburetor.
Find the flat-headed, slotted, gold-colored brass screw on the carburetor.
4
Turn the screw clockwise until the engine starts to sound rough.
Turn the screw clockwise until the engine starts to sound rough.
5
Loosen the screw and count the turns until the engine sounds irregular.
Loosen the screw and count the turns until the engine sounds irregular.
6
Set the screw in the middle between the rough- and irregular-sounding spots.
Set the screw in the middle between the rough- and irregular-sounding spots.
7
Make adjustments 1/2 a turn in either direction to find the smoothest idle speed
Make adjustments 1/2 a turn in either direction to find the smoothest idle speed.
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