Yep the answer to your question depends on your answer to the following.
How much skills so you have or how deep are your pockets or how much of a sucker for punishment are ya.
Depending on the above the biggest kit "you" can put on a puch could be
50cc , 65cc, 70cc, 74cc or even a whopping 85cc.
If money is not much of an object feel free to shoot me an email :D