Vintage Farm Equipment And John Deere Tractors

John deere lawnmower backfiring?

Fatback_pimp12 asked:

we just got a brand new automatic 24hp john deere mower, and its been used, about 3 hours, and its starting to backfire when we turn the throttle down or turn it off.. why is this? do we need a new spark plug?

Antique John Deere Tractors