Hi guys, Just wanting some advise on how much gearing changes to a bike is too much. I have a ZX6 2007 model and I have a few mods on it. Pipe, air filter and Power Commander. I have already dropped one tooth on the front sprocket but I am still in the search for more usable power... I am considering going up 3 teeth on the rear now. Any advise on if this is too much of a shift from stock? What implications will it have and so on... Also, does anyone know how the speedo healers work as my speedo is already out by a mile, this will make it worse... Are they hard to install and configure? Thanks in advance as usual!!