I've ridden my Spyder only about 3600 miles, so I'm still learning to ride it. Tonight's lesson: if I want some zippy acceleration, 4000 RPM is not going to cut it.
I was riding on a divided highway, about 60 mph in 6th gear. A doofus cage driver in front of me was behaving unpredictably, so I decided to take my first chance and zip around him to leave him in my mirrors. The chance came, and I downshifted to 4th gear and pinned the throttle open, expecting to feel a nice kick in the butt and the pretty quick arrival of 80 mph on the speedo.
Nope. Didn't happen. The tach climbed slowly from about 4000 RPM and I managed to get past the cager, but not the way I wanted or imagined.
My point of reference here is my BMW R1150RT which I've been riding for about 8 years. On that bike, dropping to 4th gear and going WOT causes me to quickly become just a memory to the driver I'm passing.
Afterwards I did experiment some with acceleration at various engine speeds. It seems like 5500 RPM is where the fun stuff begins to happen. Lesson learned.