After the carb loading thread and the all-out-power thread. I got to thinking. Has anyone ever used propane on a bike? I can see this on my S pretty easy. Pull off all the things that deliver gas to the motor, retain the stock ignition, add a low horse mixer. Remove one radiator and add the vaporizor in that location. Fab up a place to put a skinny propane tank (possibly a large capacity scuba tank). Put on an E lower gasket to get some compression. Possibly no gasket just some yama-bond if the vavles will clear the piston. That would help get the compression up. The end result would be a bike that COULD run on it's side or upside down and the power would be better than a stock S because the fuel mixture would be far better. The Gov would probably give you some money back for a GREEN bike. You would also be farely unique. Propane is safer than gas also. Cheaper too. So....insanity or probability.