2007 Arctic Cat Four-Stroke Factory Service Manual, Page 299Get this manual
Drive Chain and Sprockets (120 cc) REMOVING
1Remove the screws securing the front and rear chain guards; then remove the guards from the engine compartmentNote the position of the hood cableA019
4Press down on the muffler and pull it to the side until the muffler flange clears the engine exhaust studs; then remove the muffler from the engine compartmentAccount for the exhaust gasket5Compress and hold the brake lever; then remove the cap screw securing the rear chain sprocket to the driveshaftRelease the lever6Remove the snap ring securing the brake bandAccount for washerA017A