Lotus variable compression two-stroke
 

Not a bike engine, but looks very interesting. It's a variable compression two-stroke that can run on many different types of fuel and is claimed to be 10% more fuel efficient than a conventional petrol engine.

http://www.autoblog.com/2009/12/10/l...h-more-to-come

Re: Lotus variable compression two-stroke
 

I am a two stroke fan and was very interested when I first read about this some months ago. I still believe the two stroke is not dead and will re-emerge. Unfortunately the big manufacturers are so involved with 4 stroke development that two stoke development is being overlooked and that's a shame.