This high quality Mikuni carburetor works great on modified GX160's and GX200's. This carburetor offers more horsepower and torque over the Honda carburetors along with the adjustability of a performance carburetor. The 22mm bore is a perfect match for the stock intake valve/valve seat. Easy to install due to Mikuni's simple throttle cable setup. See the "how to" section for a free tuning manual.