The hydrosolide steads of brands offer an improved performance for Harley Davidson Sportsters models from the years of construction 1991 to 1999. These starking are specifically developed to increase the performance of the engines by enabling more efficient power transmission even at higher speeds. The starks are equipped with an anti-pump-up function that prevents the stark from expanding the unwanted extension and thus ensures a constant valve game contact. This leads to an increase in performance of 3 to 6 hp at around 5600 rpm.