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I have a Husqvarna rider model yth23v48. It has a Briggs engine model 4455771187B1. I installed an aftermarket carb a couple years ago and never had an issue with power but it does backfire every time I turn it off. No matter if I throttle down first or not. The last mow of the season I turned the engine off to grab another beer and it backfired louder than usual. Like really loud. After starting again it seems to have about half power. When I engage the blades it seems to drag but eventually go but not enough to really cut very well. I'm not sure what to look at first. Could I have hurt my muffler? Could it put the valves out of adjustment? Do I need to replace the carb again? I tried to adjust the idle and it will idle up but still no power. Again, not one issue before this until that last huge backfire. I'm at a loss. I'd like to have it ready for mowing season even though it was 27 degrees this morning. Any help would be appreciated.

It can one of several problems. First check your valve as you have drop a push rod. If so it can just an adjustment; unless, the rod is bent then it can a valve that moved. Second it can be an ignition coil failure.

As the antifire that is likely you have a bad antifire solenoid that is stuck open or someone clip it.

First thing I would be checking, is the engine running on both cylinders, before tearing into the unit. This will give you a better starting point. To do this, pull one spark plug wire and see if the engine will start. If it starts, install that wire and pull the one on the other side. If it only starts on one side, the other cylinder is not working and you have a starting point. That cylinder will have either no spark, no fuel or no compression. If no compression I would be looking for a bad head gasket or problem in the valve train.

Rivets said:

First thing I would be checking, is the engine running on both cylinders, before tearing into the unit. This will give you a better starting point. To do this, pull one spark plug wire and see if the engine will start. If it starts, install that wire and pull the one on the other side. If it only starts on one side, the other cylinder is not working and you have a starting point. That cylinder will have either no spark, no fuel or no compression. If no compression I would be looking for a bad head gasket or problem in the valve train.

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Awesome
Will try that this weekend.
Thank you.