Adjusting Fuel Screw on 4-stroke Motocross Bike Keihin FCR-MX Carburetor - same for most four stroke mx bikes with Keihin FCR-MX 37mm 39mm 41mm MX Carb and others. This video demonstrates what to listen for to know if your fuel screw is set properly. The number of turns out can vary depending on the conditions you live in and heat, humidity, altitude. Turns out should be around 2.5. If you need to turn yours our significantly more/less than this - you should adjust other jetting in the carbureto
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