Compatibility: Fits 125cc to 250cc engines. Universal fit for motocross, motocross, enduro all-terrain, motorcycle, ATV, Quad UTV Scooter.Material: aluminum alloy. Easy adjustable CNC fuel mixture screw. CNC adjustable idle speed screw. Advantage: You can intuitively see part of the internal structure. The transparent bottom shell can be replaced.Features: Ability to change pressure and allow fuel and air to flow.Universal modifications, faster acceleration, save fuel.