The Stage 7 Thunderslide CV carburetor tuning kit from brands was specially developed for Harley Davidson FX models from the years 1990 to 1994. It is ideal for engines that perform over 80 hp. The kit includes a modified top that offers the slide movements more freedom and thus improves the reaction of the carburetor to changes in the gas handle position. The innovative Thunderslide design enables precise coordination of the slide position, which leads to an optimized engine output.