Hey guys! I'm new to the motorized bicycle scene but not to 2 strokes. I've actually been building and porting high performance 2 strokes for Go-Peds for a couple years so I'm familiar with how engines work and how to make them faster. I'm hoping to build a nifty little 2 stroke motorized bike in the near future. I was wondering if those eBay bicycle engine kits are worth it and if replacement parts for them are easily available? I know there might be a sticky or something about this, but I'm having difficulty finding a clear answer on the forums (soory for the noobness). I don't have more then $300 to put into a kit which is why I'm looking into the eBay stuff.