For a friend we built a motorized bike. Then had the crazy idea of turning it into a power generator by first building a frame to lock the bike in with the rear wheel up. Then mounting auto alternators to it so that when the bike is mounted the drive chain engages sprockets to spin the alternators. We were able to have 4 alternators and the little two cycle motor was able to power them with no issues. The motor itself gets almost 160 MPG and sells for about $150. So you can use it to run around and then charge your batteries with it! Sorry I dont have any pics of the entire rig, gotta purchase another camera!