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Pro Factory Adjustable Fuel Mixture Screw Pro Factory Performance is pleased to offer the following Performance Hand Adjustable Fuel Mixture Screw for the Keihin FCR-MX 4-stroke carburetors. All of are Pro Factory performance mx racing parts are made to the highest quality standards and Machined from billet 6061-T6 aluminum then they are hard anodized in red, blue or black colors. These adjustable fuel screws replaces the stock fuel screw that is difficult to adjust your lowspeed jetting with t …