It takes a while for the new Suzuki Neptune motorcycle to accelerate when refueling.

If this is a normal phenomenon at the beginning of a cold car, just warm it up for a while. If the car is hot, you can check whether the mixing ratio of the carburetor is lean and whether the air filter element is blocked. You can try to make the mixing ratio a little thicker. If necessary, you can also clean the carburetor (the carburetor may be blocked at any time, and the new car is no exception), or add a thin pad under the fuel needle of the throttle valve to make the fuel needle slightly higher. Check whether the spark plug is broken, whether the valve clearance is too small, and whether there is slight leakage of hoses such as intake pipes.