This looks interesting – a bike powered by a hydraulic pump direct onto the rear wheel.
The Hydraulic pump is powered by a Kubota 1123cc 3 cylinder diesel.
You control the pump by using what would be your clutch – engaging the clutch opens a bypass valve – no drive, let the clutch go and your off.
The throttle gives the amount of speed by adjusting flow.

You have a forward, reverse and neutral position on a foot peg for your gear selection
It does about 65 – 80 mpg and will do about 350 miles between fill ups

I like the innovative rear suspension - airbag!

http://www.hydraulicinnovations.com/

wow !! not sure about a check plate aluminium swing arm

I looks r a t h e r heavy

Needs a little umm, should we say..."refinement". lol
Great concept though. In theory you could get away with a smaller deisel engine that that too. With some time, honing and effort that would be a very viable alternative.

I think to get some decent torque at the pump you need a good size pump - but would be interesting to see what you could buy

looks much like a certain bandit I know

I think with rising fuel costs, the alternatives to gas burners can be a bit disappointing on delivering the oomph factor and fun factor of a bike like my bandit.
But I think hydraulics could be a cool alternative – have you looked at the torque values / characteristics of hydraulic pumps, and the at the wheel rpm availability – I think refinement could produce a pretty exciting bike actually.

No to mention 2WD as well.
..... Not entirely too sure how it would increase the "pretty exciting bike" bit but

I reckon if you could get a small compressor shoehorned into lightweight chassis you could probably even use a pneumatic pump tpo drive the wheel. lol. 0-100 times could be a little slow however. Be fine once it was up to speed.....maybe a huge flywheel to keep momentum up. hehe.

Christ!!! .. what next? A steam engine?

That is wicked. I love the idea would be nice to test ride it. See what its like in real world scenarios