Vintage in appearance is key. Some companies make minis now based on original designs, so technically new, but look vintage. Dig? We're not terribly picky, but there is a line to be crossed. Like Cyndi Lauper, we just want to have fun.
We're not very restrictive about engines either. Clones are OK, but you can't drop in a motorcycle engine. We also do not allow transmissions. Keep it simple.
HotRodEd ran some sort of clone that he modified and pretty much cleaned up in every race. Hopefully that motivated others to build faster bikes for 2014.:biggrin: However, if you're really fast, we'll have to stick you in a separate class. We had single engine sidewinder karts that were lapping everyone in practice, so they got their own class even though there were only 4-5 of them. The same thing happened with dual engine karts and there were only 3 of them.
There are no fuel, tire, etc restrictions, but remember, you're on a minibike, not a Ducati. If the track officials think that you're having difficulty controlling your bike, or you can't control or stop it adequately, you may get pulled. Now, if you're planning on running something crazy in the drags, there may be more leeway for craziness, but you still have to demonstrate that you can stop and steer that much power. There's a guy that brings some really fast drag minibikes and is always a little disappointed at the lack of serious competition.