How about a diesel?

[ClassicVW_imp]

Not much info, it's probably just a prototype and aimed at military uses...

KiraVan Expedition Vehicle

 

[Henrik_imp]

That actually looks like a Track T-800 CDi. A diesel bike built in Holland, with the engine being a three cylinder diesel engine from the Smart car. <they started selling the bike in 2009, and I believe have stopped since 2012. Although a good idea, it was plagued with problems. Here is a link to a post by a guy who had one for some time, but finally gave up: My Track T800CDi E2 Dieselmotorbike

 

[Cormanus]

What a pity they were so unreliable. I've been wondering recently about the possibility of a lightweight turbo diesel in a bike. Should have realised someone had already done it.

 

[the Ferret]

Kawasaki has been producing a diesel KLR 650 for the military for at least a decade

http://olive-drab.com/idphoto/id_photos_m1030_m1d.php

The World's Only Production Diesel Motorcycle

Diesel-Sipping Motorcycle for the Marines (Published 2008)

 

[The Spaceman_imp]

Forget diesel, turbines are more reliable, can burn diesel or JP if tuned right, and you can melt plastic car bumpers at traffic lights:

MTT Turbine Superbike - Wikipedia

 

[Mike Bee_imp]

Jay Leno has a turbine powered bike.