So when I was at my local track recently there was a guy selling knock off VP C-12, 110, and U4. He showed me a print out of the HP and TQ specs when they dyno'ed a few bikes to show the power gains. He said that they had to go up 4-5 sizes in the main jets to get them to run well. They tested a few 65's, a mod 85, and a 450. Is it normal to have to go up that many sizes when running race gas? It seems awful dramatic to me, but then again, if I were an expert on race gas I wouldn't be posting this thread. What have your experiences been?