I have a couple of questions about a belt driven engine kit. I am really interested in buying an engine kit from Golden Eagle Bicycles and I have read that they have really good reviews. What's the difference between a 2-stroke and 4-stroke? I know that a 2-stroke, you have to have pre-mixed fuel and with a 4-stroke you can pull into the nearest service station and fill up. What kind of modifications can I do to make my bike go faster? Has anybody ever used a belt driven engine kit? If yes, how was the installation process and how does it run? Thanks guys I really appreciate it.