Velocity stack screw (QTY 4). We are Keihin, Mikuni and Lectron dealer - we're here to help. And, don't forget to check our other items and be sure to add me to your favorites list.The item "Dual horizontal Keihin FCR39 flatslide racing carburetor kit FCR 39 carburetors" is in sale since Thursday, April 18, 2019. This item is in the category "Vehicle Parts & Accessories\Motorcycle Parts\Air Intake & Fuel Delivery\Carburettors & Parts"." and is located in Hengelo. This item can be shipped worldwide.