I disagree, neither the 449 or 511 are street-comfortable for more than a 20 miles or so, they are obnoxious on pavement at highway speeds. Has nothing to do with the tires or sprockets or balance or seats (I have all those and while they help, its still a b@tch on pavement), its the transmission ratios and the high revving engine. Balancing does indeed help but these are not street bikes, I think Yogi needs the Terra for what he wants. The 449 and 511 in the tough dirt are a dream once we get them running right.
I rode about 120 miles today on mine, (few stops for Cups of Tea, a British thing
in quite windy conditions, had bout enough by time I got home, but tbh I find it worth it, as I said I have 17" rims with Michelin pilot sports (I think they are sports) and a smaller rear sprocket, it goes well, sure a little viby at 70 mph and over, but it is a new engine, and going to put some bar end weights on it, I might add the only vibration is on the handle bars none else where, seat ok, and only started to feel it after 100 miles of the day. if I want off road just swap wheels back over.