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  1. #1

    Join Date
    Oct 2018
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    United States
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    LawnBoy

    Question Problems With 80's Lawn Boy Model: S19ZPN

    Hello Lawn World

    A few months ago my 80's era (unsure of the precise year) lawn Boy model S19ZPN cut out on me mid-mow. Today I finally got around to diagnosing and eventually starting the mower after concluding that I hadn't added 2 cycle oil to my fuel. Luckily for me, that didn't destroy my engine and it started right up. In addition to the repair, I added epoxy clay to the wire the controls the choke valve in the carburetor (excuse my uncertain language). It ran and I let it warm up and then I left it for 15 minutes while I ran to the store to grab carburetor cleaner to mix with the gas since the mower had sat for a while. However, when I got back and added the mixture it would not start. I double checked everything including my epoxy job and it will not start back up.

    Now I am asking for the help of the internet. I can conclude (correct me if I'm wrong) that there is spark otherwise it wouldn't have started in the first place and the engine is (or did) get gas. What am I missing? If I were to guess, something is wrong with the safety toggle. Thanks in advance!

    Willam

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  3. #2

    Join Date
    Mar 2016
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    51
    Location
    Florida
    Mower
    lawnboy,honda

    Re: Problems With 80's Lawn Boy Model: S19ZPN

    I would start by checking compression.Dan

  4. #3
    Russ2251's Avatar
    Join Date
    Mar 2018
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    167
    Location
    Huntington Station, Long Island, New York
    Mower
    Lawn-Boy(6) Craftsman, Craftsman LT2000, Rally...and NO SEAFOAM or any other additives.

    Re: Problems With 80's Lawn Boy Model: S19ZPN

    I can conclude (correct me if I'm wrong) that there is spark otherwise it wouldn't have started in the first place...
    Perhaps the coil has failed. Check for spark.

  5. #4

    Join Date
    Mar 2016
    Posts
    51
    Location
    Florida
    Mower
    lawnboy,honda

    Re: Problems With 80's Lawn Boy Model: S19ZPN

    Reading what have happened,I see two problems:

    1 run mower with out 2-cycle oi

    2 adding carb cleaner to gas ???

    Now if do not have good comp,tester,-do the fallowing: remove blade & blade adapter next remove muffler.You should be able to see piston & rings,if they score --rebuilt the engine.Dan

  6. #5

    Join Date
    Oct 2018
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    2
    Location
    United States
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    LawnBoy

    Re: Problems With 80's Lawn Boy Model: S19ZPN

    Quote Originally Posted by bogdaN View Post
    Reading what have happened,I see two problems:

    1 run mower with out 2-cycle oi

    2 adding carb cleaner to gas ???

    Now if do not have good comp,tester,-do the fallowing: remove blade & blade adapter next remove muffler.You should be able to see piston & rings,if they score --rebuilt the engine.Dan
    The carb cleaner was a fuel additive. Fuel injector and carberator cleaner. Also the engine ran once for a good amount of time before crapping out again which proves the engine didnít seize right?

  7. #6
    Russ2251's Avatar
    Join Date
    Mar 2018
    Posts
    167
    Location
    Huntington Station, Long Island, New York
    Mower
    Lawn-Boy(6) Craftsman, Craftsman LT2000, Rally...and NO SEAFOAM or any other additives.

    Re: Problems With 80's Lawn Boy Model: S19ZPN

    An engine that rotates is NOT SEIZED!!!
    Check for spark.
    Model F coils are prone to failure.

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