I have a MTD 13AI67HO62 ridding mower with a B&S 20HP motor. runs good at start,but after 15 to 20 the engine starts to sputter. adding a little choke seems to fix the sputter for about 5 min, then I must add a little more choke every few minutes until I am at full choke and the engine dies.with a loud backfire in the exahust
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