Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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As any one of the other items that were mentioned could be a problem to your issue.
You may have also bent a push rod in one of the cylinders which is now causing the engine to run on only one cylinder with low or no power. You can check this by removing one of the spark plug wires from the plugs and try to start the engine. If the engine starts then switch by putting that wire back on and removing the other and try to start the engine. If the engine fails to start with either of the plug wires removed then you know that the problem is within the cylinder that fails to start with the plug wire attached. I would then proceed to a spark test to make certain that the ignition coil is firing on that cylinder since this engine has two separate coils one for each cylinder. If you have good spark then I would do a compression check on both cylinders and compare the two readings. If within 10% of each other then I would look elsewhere for the issue but if there is more than 10% difference in the two I would remove the valve cover and check the push rods, if you find no problems there then the next step would be to remove the head and check the cylinder, head gasket and valves for leakage.