by chiefss » Thu Apr 15, 2010 1:21 pm
They were designed as very inexpensive (cheap) engines. The head gasket was a rubber O ring, the cylinder was plain aluminum and the aluminum piston was chrome plated. The crank bearing wase just the steel shaft riding in the aluminum crankcase. No bronze bushing. This was the series of engines that put K&B out of business after about 45 years.
Mecoa bought out rights and machinery and produces them today. Now they do have a bronze bushed crank bearing. This was the only "large" engine series that K&B neglected to put the size on the crakcase. They came as a 20, 28, 45, and 65.