Need to know what style of Cummins engine and pump first. PT, PR, VE style rotary pump, inline Bosch pump.
On the governor, there is a black plastic cap. Remove cap. Inside is a screw. This screw will will adjust the governor.
Turning the fuel screw on a Cummins will determine the fuel flow tot he engine. If the screw is set too high of low then the engine will not run properly and could cause engine damage.
To adjust the injector on a Cummins NH 220 engine, start by ensuring the engine is at operating temperature and is turned off. Remove the injector lines and loosen the injector hold-down bolts. Carefully adjust the injector by turning the adjusting screw to the specified clearance, typically around 0.012 inches, and then retighten the hold-down bolts. After adjustments, reattach the injector lines and check for leaks before starting the engine.
The increase/decrease screw on the Timberwolf ATV engine is used to adjust the idle speed of the engine. Turning the screw clockwise will increase the idle speed, while turning it counterclockwise will decrease the idle speed. It is important to adjust this screw carefully to ensure the engine runs smoothly.
You can adjust the injection pump on your 3406 Caterpillar engine by turning the adjustment screw on the top of the fuel pump. The adjustment screw controls how much fuel the pump sense to the engine.
there is an Allen screw and a nut on the throttle cable you loosen the nut and the screw and adjust it to make it idle up or down.
Adjust the idle screw.
If it's an EFI engine you do not adjust the mixture screw. The mixture is computer controlled.
This is hard to explan but I'll try. The engine should be at normal temperture. (1) Use an optical tachometer such as Snap on # MT139 or Cummins # 3377462 to read the engine rpm (2) Adjust to low idle speed at the low idle speed screw. The srew & locknut are located at the rear of the fuel injection pump. (Looking at the pump with someone you trust slowly pushing the gas pedal. The lever at the rear of the pump will rest on a set screw when the pedal is at idle position. This is the low idle set screw). Loosen the lock nut at the bottom of the screw and adjust to factory spec. From the factory manual with an automatic 750 to 800 RPM with the park brake lock, transmission in drive & air conditioning on. (Real partner TRUST is needed here). With manual trans. 780 RPM park brake set, in neutral & air condition on.
To adjust the carburetor on a Kawasaki FC540V engine, start by ensuring the engine is at operating temperature. Locate the idle speed screw and the mixture screw on the carburetor; typically, the idle speed screw adjusts the throttle position, while the mixture screw fine-tunes the air-fuel ratio. Turn the idle speed screw to set the desired RPM, usually around 1,200-1,500 RPM for smooth operation. Finally, adjust the mixture screw for optimal performance, usually by turning it in or out until the engine runs smoothly without stalling.
To adjust the carburetor on a 1987 Hyundai Pony, locate the idle speed screw and the mixture screw on the carburetor. Start the engine and allow it to reach operating temperature. Adjust the idle speed screw to set the engine RPM to the recommended specifications, usually around 800-900 RPM. Then, fine-tune the mixture screw for optimal performance, turning it slowly until the engine runs smoothly without stalling, ensuring to make small adjustments and listening to the engine's response.
Underneath the carbs, near the throttle on the right side of the engine.