Cool, the engine started first time but it took a couple of attempts for the geezer in the flat cap to get his pipe fired up!!
At the other end of the scale, I got room for this: Had it lurking in the shed for decades. A little JAP side valve single driving a dynamo. No compression so it might have no piston!! ATCO petrol tank which may have come off a lawnmower. Looks like someone has made a battery charger from the set-up. I can see the fascination of stationary engines apart from the size of some - no road tax, no licence, generally just fun to fettle and get running.
The link below shows another stationary engine, just scroll down the page a bit. http://0flo.com/index.php?threads/2103