I appreciate the explaination but I still think a taller front pulley or motor sprocket is a much more practical solution and would save a couple grand. My scooter is hardly running at 80 mph (3000 rpm) and as I said their is definately enuff torque to pull a taller sprocket.
Now I do have some experience here, I owned an 85 fxr (a few years back) eventually I put one of the gears through the bottom of it's case (@60k), I literally spent a thousand dollars$$$ more for a 6 speed overdrive tranny replacement (paid $2400 it is installed in the attached photo) than for a 5 speed ($1200-1300). I was not impressed with what my extra grand bought me (300 rpm less), my point is that money would have been better spent elsewhere. I am just trying to pass on my experience. Oh Yeah BTW I do believe I might quailify as an iron butt, I have done 800 miles in a day [smiley=worthless.gif]