You got a good link on the video follow those directions. One other thing, when you stab the throttle, the spring on the pump linkage compresses so you don't bend the linkage. So in reality the strength of that spring controls a lot of how much and how long of a pump shot you get. If you stack a couple small washers under the spring you will make it stiffer, making sure you get a strong pump shot. Don't get carried away because if you make it too strong you can bend the linkage. But I have fixed several new out of the box carbs that had too weak of a spring this way.