The two "women" who live next door to me bought a John Deere rider mower last year,and it does the same thing!--I got quite a laugh the first day I saw them taking turns mowing with it--when they shut it off they left it running at full speed,and I heard -booohhhhhhhhhggggggg-------BOOM!..and a female shriek/scream I'll never forget!..
Evidently they didn't figure out why it does that yet,I hear it backfire just about every time they use it!.--and I saw the John Deere "mobile service" truck in their driveway a week or so ago,I bet they are having it looked at ,to find out why its backfiring..(either that,or replace the starter,they shut it off and re-start it about every 100 feet!..)
I used to be friends with them,and fixed their mowers, and did many repairs on their house and yard for them for years,even went to dinner and concerts with them for some time,thought they were "good neighbors"--then they must have come into some money,they got snooty, and felt I was "below them" or something,didn't want to socialize with me any more--they decided to knock down the old house,and build a brandy new modular home,bought 2 new trucks,and have a shed built--and they no longer need me,so I have nothing to do with them now..they did the same to a relative of theirs who lives a few houses away too,who put them up while the house was being built--they no longer speak to him!..nice people we have living around here..
But I LAUGH at them every time that JD backfires!..
It's more fun than watching the Three Stooges,every time they mow the lawn!..I cant wait till spring!..