I went out for several hours yesterday and paid close attention to my machine. It's a low mileage XS650SH with 17/34 sprockets. By my clocks, if the tack says 4000 rpm, the speedometer says 58 mph as best I can tell. I rode everything from divided highway to dirt and gravel. At 3500 RPM, the vibration is slow and low amplitude. Beautiful for lollygagging on Mississippi back roads. If I throttle too much in high gear, from say 2500 rpm, I can hear detonation (pinging). Starting at 4000 rpm, the vibrations are high amplitude. If I put my left hand on either of the clocks, I wonder how they don't go to pieces. They have to be very robust. Meanwhile, the rubber isolation bits do their job and I'm not uncomfortable. Out on the big highway, the high amplitude goes away at 4800. Running at 70 mph, it feels much smoother and vibrates like my electric shaver. The engine is in the powerband and is singing along happily. I very seldom operate it there and for this bike, it was the first time. For how I ride my bike, I'll be sticking with the 17/34 set-up as my favorite. The 4000 to 4800 rpm range shakes it pretty hard. It's not a range I want to stay in.
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