The biconical spring reminder axis of carburettor Tiltson is an essential part to ensure the proper functioning and safety of your carburettor. Designed specifically for Tillotson carburettors (HL, HW, HW27, HW27A, etc.), this spring guarantees an accurate and constant return of the butterfly axis, thus avoiding any risk of setting or losing power in the race. It is ideal for karting drivers in competition or intensive training.