It is 6hp and has no spark plug. There is a compression relief
lever to facilitate hand cranking. They, Otto Hintz and his son
Otto, Jr., used this engine for a long time but someone used
calcium chloride for anti-freeze and left the stuff in the cooling
system so that a number of holes have been eaten through the cast
iron. I believe by some careful welding, reboring and a new piston,
be restorable.