Provides about 1-2hp and enhanced torque about stock carb and is also gas combination adjustable. The 22mm is the appropriate decision Should you be running stock valves Sign up for our mailing list and become the first to get many of the latest updates, sales news and features from GoKarts https://bikeengine2stroke16531.mybjjblog.com/the-greatest-guide-to-go-kart-for-sale-47578969