Backfire

[Plmcrzy]

Any help would be greatly appreciated. I have a JD 145a with 218 hours. I have notice on last mowing that engine is backfiring through exhaust at full throttle. I have replaced air and fuel filter. And both plugs. Nothing has changed

 

[EngineMan]

It could be one of many things, maybe over rich (carburetion) and or a valve, can also be the ignition system.

 

[bertsmobile1]

Any help would be greatly appreciated. I have a JD 145a with 218 hours. I have notice on last mowing that engine is backfiring through exhaust at full throttle. I have replaced air and fuel filter. And both plugs. Nothing has changed

Backfiring through the exhaust is classic running too rich or spark too far ********.
So you are checking that the air filters are clean.
You are checking the float height in the carb.
If no joy with new filter then slip off the flywheel nut/ bolt and check that the flywheel is in the right position. Keyway shoub be a full square.