Works Connection Works Conneection Fuel Mixture Screw 26-100 Allows for no tools track or trail side tuning on your four-strokes FCR carburetor, improving idle performance Crisp, clean, positive throttle response with one finger CNC-machined from durable 7075 T-7 billet aluminum Brilliant red anodized finish and task specific designed EZ Dial knob with etched numerals Features an O-ring design to resist engine vibration and increases accuracy and longevity