This 1/4 scale model 1937 Harley-Davidson “Knucklehead” motorcycle engine was built by Replica Engines, Michigan, circa 1997. The engine is 9”-long, 9”-wide, and 9”-high. The model is a 2-cylinder, 45° V overhead valve configuration that burns gasoline or methanol. It utilizes two oil pumps for pressurized dry sump lubrication with a small amount of oil mixed into the fuel for piston and valve lubrication. It has a .75″ bore, .875″ stroke and operates on spark ignition.