Note the jet positioned at the bottom of the cartridge. (Photography: Jeff Smith) Taking this one step further, it's possible to change the jets in the carburetor even when the engine is running.

Carburetor Essential Tuning And Setup Tips ... When changing jets, ... remaining part of that company until its sale to a private equity firm in 1998.

On the bottom for the carburetor you typically have two jets. The pilot, the smaller of the two, and the main jet. Let’s start with the pilot.

Raising the rods enriches the circuit. Early Q-jets hide the adjustment screw behind a small plug in the front of the carb base/photo A).Counter-clockwise movement lowers the rods in this arrangement.