Sunline 31-00-000 Fuel Mixture Screw For Keihin FCR Carburetors
The Sunline fuel mixture adjustment screw allows you to easily adjust your fuel mixture on the track or trail with with no other tools required.  It's precision machined from aircraft-grade aluminum and fits Keihin FCR carburetors. Other features include numerically calibrated markings for tuning memory and an O-ring design that helps secure your adjustment setting.