Hey bro, Did you do ANY research on the bike? And I'm sorry you used a really crappy bike for your build, But please don't advise someone else to use a crappy bike.
I've been building Motorized Bikes for around 8 years and have over 100 builds behind me. Not bragging, just fact.
What you want to do is START with the best bike you can find and/or afford. Even a good one thats used is better than a new crappy bike.
On this site we try to give the new guys the best advice possible. Telling someone it's OK to use, in your words, "A really crappy bike" is not in the spirit of this forum.
Ride your bike for a couple years and get a lot more builds behind you before you start trying to give advice. You obviously need a little more experience.
Sorry if I sound like an a$$, I'm here to pass on the knowledge I've aquired over many years of building and forum time, And I would NEVER tell someone it's OK to use a really crappy bike.
fatdaddy.