The biggest engineering blunder (In my opinion) was the idea to make the Fleetwin idle smoother, they adding counterweights to the crank shaft. To make room for them, they cut down the connecting rods. The counterweights tended to shield the rod bearing and cutting the top rod down eliminated trapped oil which may have help lubricate the bearing. The replaced powerheads told them there was a problem. They thought in 1954 they would improve lubrication with the 4 gallon tanks (1/2 of a pint to the gallon) but they still had problems. They finally capitulated and removed the counterweights in 1957. Then (True to form) they discontinued that model. . . 🙄
