FACTORY DESIGNED FOR GO KARTS & MINIBIKES OVERHEAD VALVE DESIGN FOR EASIER STARTING & SMOOTHER RUNNING This engine has a 2-year warranty. The gas tank is in front of the engine. It may be removed for installation in a minibike frame if you are using a separate gas tank. This engine bolts right onto most go karts without any modifications. *3/4" diameter, 2-1/4" long keyed crankshaft Centrifugal Clutches and Torque Converters for 3/4" diameter crankshafts will fit this engine. 4 Tapped bolt holes around crankshaft. Our Torq-A-Verter kits will bolt up to this engine. Chain guards, etc...will also bolt to it. Soft pull starter - less pulling effort required to start. Set up with a spring-loaded throttle return. This is a factory designed throttle return system for a Go Kart or Minibike to allow the throttle cable to return properly NOTE: This engine is the updated version and has a manual choke. The manual choke allows the engine to be started more easily under most conditions