This series of engines are usually to be found on rotary lawnmowers, ride-on mowers, garden tractors, wheeled vacuums, poo pickers. They have also been used on a few models of rotovators and other equipment
They have their drive output crankshaft emerging vertically from the bottom of the engine on which is usually mounted a blade, drive pulley, fan or clutch. A pull starter and/or a flywheel guard grill will be on the top of the engine.
The piston runs horizontally and the spark plug(s) will be located on the front of the engine.
Single cylinder, V Twin and Opposed(flat) Twin Vertical crankshaft engines have all been manufactured.