do you guys really run your 650s at 4500 rpm for hours on end...?
What do you do on a big road, where everyone is doing 70 mph or more?
...A more considerate reply than I expected, TT! For the most part, I stay off the big roads. There is one highway, between here and my place of employment, which I will take if I'm in a hurry, and I'll do 70 mph, which on my A65 is 4100 rpm. But that's only 15 miles, and I'm not doing "4500+ rpm for hours". For more leisurely riding, there are plenty of secondary highways and even smaller roads around here to take me wherever I want to go.
I find my A65 runs best in the 3500 to 4000 rpm range, smoothly and with plenty of throttle response. This is about 3/8 throttle with my 32mm Miks, and the bike will run all day like that without breathing hard. It will pull easily from 40 mph in 4th gear if I'm not climbing a grade, without lugging or pinking. The only time I've ever had the bike over 70 or over 1/2 throttle at speed is when I was testing for main jet size. And the engine has never seen 7000 rpm in its lifetime. But the opinion has been expressed many times on the forum that it's not good to run an A65 that slowly, which led me to wonder if there's something different about my A65, or if it's simply a matter of preference. If it's the latter, I guess I'm content to merely "bimble about".