Still ride? we build them over here when we aren't riding. Drex designed and built this Micro Mini. It's a weeedeater engine and razor scooter parts. The rest he fabricated. He used a jack shaft to do the gear reduction and get the drive to the rear wheel so he wouldn't have to offset the engine. Not the fastest thing around but pretty cool. Built it for a school project. Teacher was impressed.

Here's a link to a video of it in action.