1. Locate the air/fuel mixture screw. It is usually located on the side of the carburetor, near the throttle linkage.
2. Use a screwdriver to turn the air/fuel mixture screw clockwise to lean out the mixture or counterclockwise to richen the mixture.
3. Start the engine and let it warm up to operating temperature.
4. While the engine is idling, adjust the air/fuel mixture screw until the engine runs smoothly and without hesitation.
5. Test drive the vehicle and make adjustments as necessary.
Here are some additional tips for adjusting the gas and oil mixture on a 1987 B2200 PU:
* If the engine is running too lean, it may backfire or hesitate when accelerating.
* If the engine is running too rich, it may idle roughly and produce black smoke.
* The ideal air/fuel mixture is one that allows the engine to run smoothly and without hesitation, with a slight bluish tint to the exhaust smoke.
* It is important to make small adjustments to the air/fuel mixture screw, as even a slight change can have a significant impact on the engine's performance.
