This was purchased new 2 years ago. Never had any problems. Was riding around the lake this weekend and then docked it for a half hour. Went back to start it and all you hear is a loud "clunk" when you hit the start button. Replaced the battery and checked the fuses. Any other suggestions. It did seem to start hesitating and smoking (just a little more than usual) before docking it. Could the engine have gone out on it? It was purchased new and only driven about 100 hours. Oil was alway's checked and filled before taking it out. THANKS!!!