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Upgrade your motorcycle or pit bike with the Alconstar Keihin PWK-Style Racing Carburetor Kit. Engineered for both 2-stroke and 4-stroke small displacement engines, this high-performance carburetor provides crisp throttle response, optimized fuel-air mixture delivery, and noticeable power gains across the RPM band.\n\nFeaturing bore diameter options from 21mm up to 34mm, this universal carb is ideal for motocross bikes, dirt bikes, pit bikes, mopeds, scooters, and custom retro builds. Each unit is constructed from premium zinc-aluminum alloy for durability and stable tuning. Complete with a high-flow mesh air filter and rubber manifold adapter, it’s the ultimate drop-in tuning solution for weekend riders, DIY mechanics, and off-road racers looking to maximize engine efficiency without breaking the bank.