More than likely, the crank shaft is seized, if the engine is not turning over when you bump starter. To check the crank, remove both of the spark plugs from the top of the motor, then reach down towards the back of the motor where there is a gray cover over the output shaft to the pump assembly. There are two plastic wing nuts holding that cover on. Take them off and set the cover off to the side. With your hands, grab ahold of the PTO (the large cylindrical weight under the cover) and try to turn the motor counter-clockwise. If the PTO, which is connected to the crankshaft will not turn over, than your crank bearings are shot and the crankshaft will have to be replaced. Try that simple things first before you try to start tearing into the starter, which is way up under the ski and a lot harder to get to. Plus, that is what it sounds like to me (I have heard enough "clicking" noises from starters to know thats what it is.) Good luck buddy.