just a thought that came into my head reading a scooter thread. i own a 1984 rg250 gamma. enormous amount of fun. love it to death. but it really doesnt get very much as far as ks per litre is concerned. does anybody know how difficult/possible it would be to (when the current one dies of course*) replace the engine with a more efficient four stroker. i'd love to keep the thin light frame. * odometer just ticked over 98000 i dont have a full history and my bet is that either the engine has been replaced or the speedo has. but it still has heaps of compression. so this wont be the near future i dont think.