Compatibility: Fits 75cc to 125cc engines. Universal, fits Dirt Bike, MX, Motocross, Enduro, Motorcycle, ATV Quad UTV.Material: Aluminum Alloy. Easy adjustable CNC fuel mixture screw. Adjustable idle speed CNC 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.Compatible with:28mm fits 75cc to 125cc engine . 30mm Fits 100cc to 150cc engine. 32mm. Fits 125cc to 200cc engine. 34mm. Fits 125cc to 250cc engineFeatures:100% brand new, never mounted, high quality. You will receive exactly as pictured above. Because it is measured manually, there will be a little error in part A, B, C and D. But don’t worry, caliber 28mm, 30mm