Mr Tickle

I fitted one of these to my Ducati 821 Hypermotard and it did make a difference...richened the fuel mixture particularly at the bottom end of the rev range and nearly got rid of the flat spots arounf 6K rpms

I'd say that if you have Kev fueling mod fitted it probably a better solution as you can adjust the mixture with the pot

if you dont have one fitted, i'd recommend it, especially with and air filter kit... 660 engine now pulls from 2K (within reason) and is happy to chug up steep loose hills and cruise through town in 4th/5th

Dave