I just saw that there was a predator 99cc engine (item# 68124) and I called they were discontinued? now you get the 79cc predator, whats the difference? Who is running these on a minibike? I only ask because I am building a very small minibike and every motor I have is too big for the frame, and I want to try one of these out? let me know who has one of the 99cc or the 79cc?