since you're 16 and looking for a 2 stroke motored solution to an existing bike, the only limiting factor is pretty much frame size. Any frame mounted engine will get you around semi-reliably with some constant love and attention, and then it's just a choice of size and quality. We need pics of your bike or at least a link to the model to evaluate viability of those things.
Apart from that, you might have trouble getting off the thing once you get to the skate park, because it's too much fun, it really is. Keep in mind the bike can't be laid on it's side once you get the engine, 'cause the tanks leak without major-mods/replacement. Also keep in mind these engines (especially the cheaper ebay 2 stroke Happy Time type engines) require a lot of constant attention. Don't get me wrong, it's worth it, but if you're someone who doesn't like to get a little bit greasy or aren't a little mechanically inclined, it might be a bit frustrating for you. On the other hand, any problem you have, there is this community to back you up, we haven't failed yet i don't think!
