? about shutting down a 23HP Toro Z Master

Discussion in 'Mechanic and Repair' started by Gilla Gorilla, Jun 10, 2005.

  1. Gilla Gorilla

    Gilla Gorilla LawnSite Senior Member
    Posts: 923

    I have a friend that just bought a new Toro Z Master with a 23 hp Kohler and he was telling me that the dealer told him to shut it down with the throttle at least 50% and up to 75%.

    When he told me this I said that it did not sound rite to me so I asked my Exmark dealer today about that and they laughed and said that it is amazing how a guy that knows nothing about mowers can sell them still. I guess they know about this guy already. The mechanic at my dealer told me that when you shut it off at that throttle amount that it keeps letting fuel into the engine but you have not spark and can possibly blow out the baffles in the muffler. The Toro dealer said to do it this way to prevent the engine from not shutting down smoothly if you let it idle for a minute or so then shut it down and it will have a small backfire, nothing big just like a poof.

    Anyways I am just posting this to see what some of you techs out there on this forum have to say about this.

    Thanks for the replies.

    Justin
     
  2. riches139

    riches139 LawnSite Senior Member
    Posts: 369

    Let it idle for a short time to cool, then just shut down. Shouldn't backfire at all.
     
  3. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024

    Thats amazing and humoring that somebody would even think such a thing much less tell a customer this :dizzy:
    ALWAYS run the engine down to idle for a few seconds before shut-down.
     
  4. Gilla Gorilla

    Gilla Gorilla LawnSite Senior Member
    Posts: 923

    I forgot to mention the main reason that the guy selling the Toro said to do it this way.

    He says that there is a 1-100 chance that if you shut the engine down at idle the engine could backspin and bend a valve.
     
  5. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    LIKE I SAID BEFORE ! :dizzy:
     
  6. TLS

    TLS LawnSite Fanatic
    Posts: 7,940

    The guy is RIGHT!

    Proper procedure for NO backfires.

    1) Mow lawn.

    2) 3/4 throttle back to trailer

    3) Down to idle once on trailer

    4) Strap down and secure mower

    5) Raise rear gate

    6) Reach over and turn ignition switch OFF at the same time raising throttle to 1/2 or more.

    Will NEVER backfire doing it this way.
     
  7. C&KLawnCare

    C&KLawnCare LawnSite Member
    Posts: 246

     
  8. ed2hess

    ed2hess LawnSite Fanatic
    Posts: 12,966

     
  9. TLS

    TLS LawnSite Fanatic
    Posts: 7,940

    Backfires will cause harm to the muffler. In some engines (mine in particular) this can lead to loosening muffler debris and them sliding DOWN the exhaust pipes and into a valve.

    No need to shut down at full throttle. Do as I said and see if it works for you.
     

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