The model-specific Fi2000R features three adjustment screws, called pots, which are preset for the make and model. Two pots adjust low speed and mid-range settings that should take care of most lean air/fuel mixture problems. The Fi2000R also has a third adjustment for high range that functions much like a main jet on a carburetor. This third tuning option is for use with engines that have high flow air filters and or extensive modifications such as big-bore kits, higher compression or other performance increases where more fuel is required in order for the engine to run properly in full-throttle positions.

Because the Fi2000R is designed to eliminate the low rpm lean air/fuel mixtures (just like the Fi2000), it does not increase maximum horsepower, though in most cases it does provide a smoother power curve and improved rideability across a wide rpm range.