well u have to take off the flywheel and the stator is right behind it...........but if its the stock timing u might have a sheared off woodruff key......take off the flywheel and look for the key on the crankshaft
well i would start simple....clean the carb, change the plug, clean ur airfilter......its highly unlikely that the key is sheared off, unless u tore the motor apart and didnt tighten the flywhell good