Re: Engine kits
Speed is dependant on the sprocket size. Lower=higher top speed. Most kits come with 44t so expect a top speed of around 25mph. Lower sprockets can get up to 40mph and well tuned bikes can even hit 50. Most kits are about the same. Some engines claim to have advantages, but you can never be sure what you're gonna get. As long as you take good care of it, it should last hundreds of miles. To build them you'll need a drill, wrenches, hex wrenches, and a dremel for cutting the chain.