if it only backfires when shutting off, usually this means its getting to much gas!! if it backfires will running adjust carburater.
Back fire can be caused by improper ignition or the wrong fuel air mixture. With the engine off remove the air cleaner and look below it. If there is fuel in the pipe then the carburetor is not stopping the flow of fuel and it needs a rebuild.
Rev the engine six or seven times before coming to a complete stop. Rev it all the way to the edge every time you stop.
Backfiring.
Kohler for sure
More than likely you have a exhaust leak.Check the headpipe seal
NO, but a good tuneup will probably cure your problems. There is no cure in a can for the symptoms you list.
If it is backfiring only when you kill the engine, allow the engine to idle a few minutes before you kill it. If it is backfiring while in use, check the intake gasket and bolts for wear or looseness.
The best answer for this is: Get a tune-up.
To stop backfiring on a motorbike, ensure that the fuel system is functioning properly by checking for any air leaks, as well as ensuring the fuel mixture is correct. Regularly inspect and clean the spark plugs, as dirty or worn plugs can lead to incomplete combustion. Additionally, examine the exhaust system for any blockages or leaks, which can also contribute to backfiring. Adjust the engine timing if necessary, as improper timing can cause backfiring issues as well.
backfiring.
Hattiesburg, Miss. is the US factory for Kohler engines.
If it is backfiring the timing is set incorrectly or the spark plug wires are not connected in the correct order.