Not too sure what you mean by small, but it might be because i shared the link using my iphone and it may have caused an issue. When i put it on youtube with my comp it looked good. It was a full 1/4 mile. I was dealing with some traction issues of the line. The track was all chewed up and not prepped very well as they were going to do all of their prep the next day for a big event. Went back the following weekend and had much better runs.
I figured it out. The first link takes me to a mobile Youtube page that I've never seen before. When I click on the video, it literally is less than 25% of my screen in width and height. There is a link for "desktop" that takes me to a regular Youtube experience.