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This OKO carburetor kit is for OSSA MAR 250s. It comes with all you need to replace your old AMAL MKI carburetor. The D slide carburetor is a genuine OKO and not one of the Chinese copies now flooding Ebay. (Last photo, box on the right with the Taiwan flag is a genuine OKO). We have been using these kits for about eight years now, for OSSAs that compete in our Mid-Atlantic Trials series, as well as for others. They provide smoother idle, increased throttle response and greater power, especially in low to mid-range. The kit comes with the carburetor jetted for the MAR 250 and includes a rubber manifold adapter for early MAR 250s or a rubber sleeve for later MAR 250s, a sleeve for the air box hose and extra jets for fine tuning. Photos are of an MAR we fitted with this kit. We have since changed to the straight top with the adjuster. As trials riders, we stand behind the OKO, providing a two week return policy and a 90 day warranty should you have any issues with the carburetor. Feel free to ask any questions. We will get back to you within 24 hours, usually within just a few hours. Please note: For early MARs that came with a metal flange adapter, we remove that adapter and replace it with a rubber flange adapter. For later MAR 250s, that came with a spigot from the cylinder, we provide a rubber sleeve to attach to the carburetor. Please let us know if you have a later. model.