This is how the early Lanz tractors reversed themselves, they only had one gear. Moving the tractor into reverse involved throttling the engine back until it was .brDemonstrating how the Lanz used a two stroke hot bulb ignition semi diesel system to be able to run in both directions perfectly. This elimenated the need for a .brA demonstration of Lanzs first mobile engine. In its elegant simplicity, it is a stationary 12hp, 6 litre, single cylinder hot bulb semi diesel engine mounted to a .