I have a new, still sealed in plastic, pulley for sale. I just don't see the point in installing it. I'll sell it for $150.00 plus actual shipping charges. When you install it, if your bike has a tach, this is the difference you'll see.
The speed sensor reads the output (pulley) shaft RPM and converts it to speedometer speed. The only thing that will change is your actual speed, and your speedometer will read a little more accurately.
My bike with the stock pulley shows around 3925 RPM at 70 MPH indicated.
The GPS actual speed is 63.5 MPH. When I accelerate to a true 70 MPH, the tach then shows about 4175 RPM, or a 250 RPM difference.
Math calculations and even Scootworks show that the ratio change will give you a 5.9% reduction in engine speed. With the original pulley installed, if 4175 gave you a true GPS speed of 70 MPH, you can count on 4175 RPM minus 5.9% would equal a drop of 246 RPM. You will then be cruising a true 70 MPH while turning 3929 RPM.
I've seen claims here alluding to a 1000 RPM drop, and others say it's like having a whole new bike! It's only giving you approximately a 250 RPM drop at 70 MPH! The only way you're going to see a 1000 RPM drop is when you realize you've forgotten to shift out of fourth!
I would like to see a sixth gear too, but I would like to see it in the form of having a closer-ratio gearset through the range.
I'm also in favor of overdrive, but not in every gear! I can cruise through town at 35 MPH at the bottom end of third gear without feeling like I'm lugging the engine. With the overdrive pulley installed, I would probably want to remain in second gear at the same speed.
Sorry if I don't count this pulley in the same category as sliced bread, but I just don't think the effort, and the problems with adjustments and belt squeaks is worth it.
So who wants it?