Well I don't know if you bet money on the Harley 4 cylinder bike or your brother-in-laws. But,,,,Harley has never built a (production) 4 cylinder Harley Davidson motorcycle. Ride Safe, David.
Perhaps your thinking of the Indian MoCo of the early thirties, and there might be other ones that built an in-line-four also in that era. Those in-line’s are probably the collector item to have.
