Oooh tractors!
My favourite is the Field Marshall single cylinder diesel.
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They were made from 1945 to 1957. There was an earlier 'Marshall' - still a two-cycle single cylinder diesel but with an 8-inch bore and 10-inch stroke - that's 503 cubic inches! By 1945 the engine was a bit smaller capacity but higher revving. The starting procedure was a bit strange - a smouldering paper was screwed into the cylinder head and then the motor was cranked by hand. An alternate method of cranking the engine is to fit a blank shot gun cartridge into a special cartridge holder on the intake manifold and detonate it using a hammer - this cartridge method is not favoured by proud owners though as it causes wear and potential damage to the engine.