Keihin PWK Carburetors from Sudco have set the standard for producing maximum power and improved throttle response without compromise for off-road motocross, dirt bike, and ATV applications. Special design features include a chromed semi-flat D-shape slide for improved throttle response and increased flow at high RPM, quad-venting to eliminate bogging when jumping, and Air Striker models, which direct air to the main nozzle for improved signal and throttle response. Standard PWK Series Carburetors are available in 28, 33, 35, 39 an 41mm sizes. PWK Quad Vent Carburetors come in 36mm, and PWK Air Striker/Quad Vent Carbs in 35 and 38mm sizes.