Hey ky, congrats on the new baby! I'm just down the road from you in somerset. Minibikes are great fun to build and ride, and thunderbirds are a perfect platform to start with. Trust me, you'll want more power than the stock engine can give you (if it's just the stock 3.5ish hp engine)....but a stock predator 212 cc engine works great on these bikes, and they're cheap to swap in.