ATACC
(Automatic Temperature and Altitude Carburetor Compensator)
This compensator will automatically keep your carbs tuned through all temperatures and elevation changes of up to 8000 feet (2400 meters). The standard compensator is set initially for operation with -20F (-29C) carb jetting for use with snowmobiles, but can be set to use with any jetting temperature. It is also easily set for any operating base (minimum) altitude. This compensator is recommended for the mountain rider who wants to play, not jet.