Adds about 1-2hp and improved torque above stock carb and it is gas combination adjustable. The 22mm is the best decision Should you be managing stock valves Be a part of our mailing list and be the very first to obtain all the latest updates, sales information and features from https://bike-engine-kit26901.fitnell.com/75886435/the-5-second-trick-for-go-kart-track