Harley Dieselson (love the name), this is a Sportster with a Chinese Punsun vee twin engine and a CVT hence the massive primary cover. Punsun's and sportsters go well together, but weather a punsun is a good engine is another thing, as there has been some bad reports of crank cases cracking up in vital points (lets hope the owner has no problems). Having said that I like this bike and the others that I have seen like it, it certainly sounds nice with it's straight through exhausts.  

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This bike is an EVA Track T800 CDI made in Holland, it has very impressive performance figures.

If I remember correctly they were 110 mpg (or was that 140) @ 70mph and a top speed of 120mph. Wow, that kind of rubs Neanders nose right in the poo. 

I prefer this bare track bike, it has so many possibilities, it would look nice with a chrome headlight and wide bars.

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This is an Indian Royal Enfield with a single cylinder Hatz stationary engine.

 I think it's a 12 horse power which should give up to 140 mpg and reach a top speed of 60-65mph, a perfect commuter bike.

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Same as above.

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This is a Triumph Tiger with a Lombardini three cylinder stationary engine hooked up to a 6 speed Harley gearbox.

Built in Germany, and imported in to the UK by it's present owner, he didn't have a lot to say about it other than it does 70mph, and hopes for better when the engine has had a bit of use.  

Amended: The engine is of a similar output as my RD211, but a more refined three cylinder. The benefits of a three cylinder is a three stage crank which is a lot smoother than a twin which means les vibrations? Also I'm guessing that the flywheel is lighter as the strokes are split in to three and so needs less fly wheel weight for momentum. I have seen adverts for aftermarket overdrive gears for Harley gearboxes which should mean a lot of saved fuel on long runs.