YeeHaa, I dropped the front cog down 2 teeth. This thing is a rocket on roids now. I dont have the $ for the jet kit and pipe, I dont care much at this point though. I haven´t had the chance to go off road since the change, probably a good thing though with next to no traction on the rear until i can spring for new rubber. Unsure of my top speed but am guessing i may get about 60mph? without reving it´s ring out. No biggy for me, i only travel 30 k( 15mile) before i get on the dirt anyway. I can tell you though, it´s very snappy, and VERY lifty at the front. I rode a 04 510 the other day, our bikes will never be that snappy because of the extra 40 kg/ and cam. i dont care though, my 14 toother is in a box for the days i want to go long haul. I do know that this bike will spit mer off i´m not paying attention now.!! IT ROCKS