While have seen various references to sporty's over the years, none to my face. While not comfortable by any stretch of the imagination, my 73 XLCH could easily pick it's wheel off the ground shifting to second gear. Attributed this to it's light weight (almost 100 lbs lighter than current versions) and lower gearing. I was young, and it was fun (excepting hwy cruising).
It's all power to weight for tricks like that.

Some people may not be old enough to realize that 1200cc's was the size of the older "big twins". On the roads am preferring now a days, very rare to see any other motorcicles, let alone any larger ones or ones with a skinny front tire and high handlebars. Fortunately there are various options for varying purposes/styles. Then again, am not seeing many sportsters on the interstates up here.
Me neither, but HD had let design of Sportys pretty much languish while continuing development of big twins. Now with the liquid cooled Sportster S, Sporty development seems back on track.
2023 Sportster S Motorcycle | Harley-Davidson USA
More on the Revolution Max engine:
More Than You Probably Wanted to Know About the Harley-Davidson 1250 Revolution Max Engine | Motorcycle.com
In any event, once they went to pressed cranks and a reluctor for timing, hopping up Sportys is limited to cylinder swaps and head work/cams on the new (er) sporty platform. For large displacement you just can't get to there from here.
I remember when getting a big bore , stroker sportster required only a few calls - one to Andrews for cams, one to S&S for cranks, rods and pistons and one to Trock for cylinders. Now getting parts is like looking for hen's teeth

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