The oversize S&S engines are too expensive. It's cheaper to downshift to 4th than spend all that money on that.
IMO, HD would be so much better if they went to liquid cooling and overhead cams and no push rods. In that case, they would get the same performance out of a 80 CI engine. Buell figured that out when he decided to ditch the obsolete air cooled push rod engine. He wasn't smart enough to come up with an engine type that's been around for decades so he outsourced it to Austria. Hmmm, that's just like when HD asked Porsche to design the Vrod.
IMO, HD would be so much better if they went to liquid cooling and overhead cams and no push rods. In that case, they would get the same performance out of a 80 CI engine. Buell figured that out when he decided to ditch the obsolete air cooled push rod engine. He wasn't smart enough to come up with an engine type that's been around for decades so he outsourced it to Austria. Hmmm, that's just like when HD asked Porsche to design the Vrod.