I purchased a used Craftsman tractor that looks to be in good condition, started and ran well. After taking it home, I could not get it to start. Turn the key and all it does is click, click, click. I thought it was the starter, so put a new one on. Turn the key and click, click, click. Next thing was a new starter switch. Turn the key and click, click, click. Next, I replaced the solenoid. Turn the key and click, click, click. Ok, maybe the battery isn't strong enough. Replaced the battery. Turn the key and click, click, click. All this time, it will start if I jump it from the battery to the starter directly. I spoke with a man at a parts place and he suggested replacing the gasket in the carburetor along with a new fuel filter. Did that, turned the key and click, click, click. This is driving me crazy not being able to fix this tractor. Can anyone help?