Yes, I am the heaviest of the kart drivers at (247 lbs) and also one of the older ones at 58. Those 2 factors tend to make me slower, but the real thing is that I have not been karting all that long. Slowly but surely I am getting faster. The karts as a group did much better on Sunday once we figured out the gearing and speeds. Jake, the real fast guy is the lightest of the kart group, and the youngest.
Sorry no videos. The guy that runs a helmet cam did not come this year.
Here is a video of a very fast MR2 (the driver does almost as much hand checking as a kart driver would, he was really driving on the edge which is what it took to be fast a top finisher) You can extrapolate from here how much faster the karts were going.
https://www.youtube.com/watch?v=9xik0J1TnnM