With or without air filter 19 mm intake Manual hand choke with lever on left Here is a carburetor for all of those “Honda Style” 4-stroke air cooled gas engines This is a PZ19 carburetor by KF (KunFu) Standard of Japan and is compatible with a variety of scooter, ATV, and dirt bike models, including the Honda Aero 50, Aero 80, Honda CRF50 dirt bikes, and Gyro scooters, and all of the Honda clone Chinese made dirt bike and scooters of these modelsDescription Here is a carburetor for all of those “Honda Style” 4-stroke air cooled gas engines. This is a PZ19 carburetor by KF (KunFu) Standard of Japan and is compatible with a variety of scooter, ATV, and dirt bike models, including the Honda Aero 50, Aero 80, Honda CRF50 dirt bikes, and Gyro scooters, and all of the Honda clone Chinese made dirt bike and scooters of these models. It is typically used on Honda style single cylinder engine sizes 50cc, 70cc, 90cc, and 110cc, but occasionally can be found on larger size engines.B