:p Speaking of single cylinder four strokes, I have a '58 BMW Isetta. It's a 300 cc four stoke engine with the firing order "1". It will go 50 mph under the right conditions. I've also had a Messerschmitt 3 wheeler KR-200. A single cylinder 2 stroke of 197cc powered the beast. It too would go 50, but with ultra direct steering and the ability to get up on 2 of the three wheels made quick turns exciting. A neat thing about the 'schmitt - to get reverse you shut off the engine, push in the key and the motor re-starts BACKWARDS - you have four speeds in reverse if you dare !!