This high-quality carburetor for Keihin FCR 39 is a perfect fit for KTM 400, 450, 520, and 525 with a 4-stroke engine manufactured between 2001 and 2004. With mechanical choke and jetting features, this carburetor is an ideal choice for those who prefer dual sport and off-road motorcycles. This carburetor is a genuine replacement part for your KTM motorcycle and comes with all the necessary features to enhance your bike's performance. Whether you are an avid off-road rider or a casual rider, this carburetor promises to deliver optimal performance and durability. Note this item does need Main and Pilot Jets!