John Deere D100 smoking and thudding noise

jetondreau

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We have a John Deere D100.

A month ago we did the yearly maintenance, cleaned the corroborator, replaced the spark plugs and fuel filter bought a new battery. The John Deere ran fine after this until yesterday. The engine cranked but would not start. We replaced the spark plug again after noticing the old had some oil on it. Not sure if the oil got on the spark plug though from the diagnostics because it was not a ton. After replacing the spark plug the John Deere turns on but makes a thudding noise and blowing white smoke. We ran the engine for minutes and the smoke and noise did not go away. We hadn't replaced the oil this year so we drained the oil and refilled but the same thing happened. If we adjust the throttle the engine practically turns off when the throttle is low. We suspect it could be the flywheel key but need to get more parts to actually inspect it and we are going to get a spark plug gap but we have to order online and wait for these to come in. Is there any other things we should look into to repair based on this info? Any help would be appreciated.
 
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