If you are running at high rpms and turn the key off the unburned fuel will be pumped from the cylinders in the engine into the muffler. The muffler is still hot enough to ignite the unburned fuel.
because it does. only god will know for sure or your local lawn and garden shop mechanic.
because you have to much gas in the motor
Unburned fuel in the exhaust system causes the backfire from the exhaust pipe.
I think you are hearing pressure pops. Not a backfire.
Black smoke is : too much fuel and not enough air, a faulty injector (s). Take out the injectors and have them tested before you do engine damage.
A Massey Ferguson tractor can backfire due to several reasons, primarily related to fuel and ignition issues. Common causes include incorrect timing, a rich fuel mixture, or unburned fuel igniting in the exhaust system. Additionally, problems with spark plugs or fuel injectors can contribute to backfiring. Regular maintenance can help prevent these issues and ensure smooth operation.
a backfire is caused by incorrect timing or not enough back pressure in the exhaust pipe
It's lean.
It's lean.
Backfire is normally caused by engine out of time, or spark plug wires installed incorrectly.
Your car is running too rich.
bad gas