Sudco PWK 38mm Air Striker Carburetor. The Keihin PWK Air Striker Motocross racing carburetor is refined to perfection and has set the standard among motocross racing carburetors. With its new features the PWK will continue to be the first choice in performance carbs for your 125, 250, Enduro or ATV. PWK Air Striker Carbs are available in two popular sizes to cover all your horsepower requirements. Local pickups are welcome! We must be notified within 24 hours of receipt of any missing, defective or damaged goods. Any item which has been used, worn, damaged or had tags/labels removed will not be eligible for return. Any damage claims may be exchanged for the identical item only.