No, cams just don't get bad from sitting. A cam is a solid chunk of steel. They do eventually wear out, but don't work one day and suddenly go bad the next. Take the fuel line going into the carburetor off and crank the engine with the coil wire disconnected. You will want to see fuel coming out of this line. If it's not you either have a bad fuel pump or something is blocking the line. Make sure it's not bad gas also. You'll know if it's bad by the smell. It will stink to high hell.