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  1. #11
    Epic Contributor MossRoad's Avatar
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    Aug 2001
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    26,469
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    South Bend, Indiana (near)
    Tractor
    Power Trac PT425 2001 Model Year

    Default Re: Backfires after shut down 2013 Hustler Super z 35 hp Kawasaki

    I moved your thread to owner/operating. You'll probably get more replies here.

    As Bird mentioned, try throttling your machine back to idle, and then wait 20-30 seconds. Then turn it off. That worked for every machine I have with the exception of a 8.5 Briggs that I had. That would backfire every time at shut down no matter what, but it did lessen it from a BANG to a small pop.
    MossRoad

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  2. #12
    Epic Contributor Bird's Avatar
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    Mar 2000
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    Texas

    Default Re: Backfires after shut down 2013 Hustler Super z 35 hp Kawasaki

    As Bird mentioned, try throttling your machine back to idle, and then wait 20-30 seconds. Then turn it off.
    Shutting one off at idle was what I did for many years. But that will guarantee a backfire with my current Kohler. I said to throttle back to an idle for 5 to 10 seconds, but then go back to full throttle and turn off the key.
    Bird

  3. #13
    New Member Hatman Tractor's Avatar
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    Oct 2013
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    5
    Location
    Covington Ga.
    Tractor
    2013 Hustler Super Z 60" w/35 hp Kawasaki, 2003 John Deere X485 w/25 hp Kawasaki DF EFI engine

    Default Re: Backfires after shut down 2013 Hustler Super z 35 hp Kawasaki

    YI have tried shutting it down at 1/2 and 3/4 throttle and it stills backfires only a little louder.

  4. #14
    New Member Hatman Tractor's Avatar
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    Oct 2013
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    Covington Ga.
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    2013 Hustler Super Z 60" w/35 hp Kawasaki, 2003 John Deere X485 w/25 hp Kawasaki DF EFI engine

    Default Re: Backfires after shut down 2013 Hustler Super z 35 hp Kawasaki

    Did that help any with the backfiring ?

  5. #15

    Default

    My kubota zero turn back fires after I shut it off to!

  6. #16
    Platinum Member
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    Mar 2006
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    826
    Location
    BEECHER CITY, IL
    Tractor
    KIOTI DK45S

    Default Re: Backfires after shut down 2013 Hustler Super z 35 hp Kawasaki

    Briggs engines have a common fuel passage for both the high speed and idle jet of the carb, which the fuel shutoff solenoid shuts off when you turn off the key. Koher, and Kawasaki have two separate passages for high speed and idle. When you shut off the key it only shuts off the high speed jet, and not the idle jet, So the engine will continue to draw fuel through the idle jet at shutdown, which is the reason Kohler and mostly like Kaw recommend shutting off the engine at 3/4 to full throttle.

    had a customer with a toro timecutter that would always backfire at shutdown, Changed the fuel shutoff solenoid, clean carb, and still would backfire. A couple of years ago the engine on this mower dropped a valve and knocked a hole in the piston. Customer had me install a new engine. and the new engine also backfired. the only thing in common between the engines, was I had to reuse the old muffler.
    ILLINOIS ENGINE, Beecher City, IL
    Briggs and Stratton MST (Master Service Technician)
    ILENGINE over at Lawnmowerforum

  7. #17
    New Member Hatman Tractor's Avatar
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    Oct 2013
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    Covington Ga.
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    2013 Hustler Super Z 60" w/35 hp Kawasaki, 2003 John Deere X485 w/25 hp Kawasaki DF EFI engine

    Default Re: Backfires after shut down 2013 Hustler Super z 35 hp Kawasaki

    RandyT your response makes the perfect sense as to why the backfire happens. I had no idea that Kolar and Kawasaki had both a high and low passage, this would explain why the backfire takes place as the engine is still drawing in fuel from the low idle passage Thank for the tip.

  8. #18
    Elite Member Redneck in training's Avatar
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    Nov 2008
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    South Central Iowa
    Tractor
    TYM 330 HST with FEL

    Default Re: Backfires after shut down 2013 Hustler Super z 35 hp Kawasaki

    Our Grasshopper has Kohler 27 HP engine. We shut down at full throttle never backfires. The original engine was also Kohler but 25 HP. Always shut down at full throttle. Never backfired.
    When you shut down with throttle closed the vacuum downstream of the throttle will suck in gasoline, overfuels the engine then the fuel remaining in the suction tract ignites when suction valve opens because there is still burning fuel in the cylinder. When the throttle is fully open there is no vacuum low enough to suck in fuel from, presumably idle or choke nozzle. Main nozzle gets shut off by a stop solenoid.

  9. #19
    New Member Hatman Tractor's Avatar
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    Oct 2013
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    Covington Ga.
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    2013 Hustler Super Z 60" w/35 hp Kawasaki, 2003 John Deere X485 w/25 hp Kawasaki DF EFI engine

    Default Re: Backfires after shut down 2013 Hustler Super z 35 hp Kawasaki

    Thank you all for the input that has really helped out with this problem. I have taken all of this advise an tried an experiment and it has worked. On shut down for my engine I pull the throttle back to slow idle for about 30 seconds and then push the throttle to wide open as shut the engine quickly off without even a hint of a pop or backfire.
    Thank you all for all the great idea's.

  10. #20

    Default Re: Backfires after shut down 2013 Hustler Super z 35 hp Kawasaki

    Thanks for this thread. I have a new Super Z, and if I forget and throttle back just before turning the key to "off", I get a loud backfire. Now I recall the salesperson telling me to only turn the key "off" at 3/4 throttle.

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