Re: How do I do it?
First off don't get too hung up on speed. These things are still bicycles and will only take so much abuse. The basic 48cc or the "80"cc chinese 2-cycles will get you about 30 mph+ depending on how you gear it. I am of the opinion that running them much over that is looking for hurt. There are some here who will disagree with me on that but just my $0.02. Good luck.
If it can't be broken I'll find a way!
I'm not lost, I'm exploring!