..Basic instructions for replacing the boss drive: 1-Remove bolts(8mm socket) from the cvt cover 2-Remove hex nut (17mm socket) from crankshaft 3-Remove outer half of drive pulley(drive pulley face) 4-Remove drive belt from shaft 5-With left your hand, hold inner half of pulley(movable drive face),and with your right hand remove the boss face drive(variator spacer). Be sure that you hold the inner pulley half securely to insure that the roller weights remain in their proper position (they could fall out) 6-Insert new drive boss 7-Install belt 8-Install Pulley half and hex nut..(add a bit of blue Lock-Tite) 9-Install cover...
..enjoy the increase in performance!!!
..if you've installed a free-flow air filter, you also need to increase the size of the main jet in your carburetor..
..with these mods, you should easily get up to 70+ kmh..