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  1. #1

    Join Date
    Apr 2013
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    4
    Location
    New Jersey
    Mower
    Toro

    Chain saw starts but stalls after a few seconds

    I have tried every possible thing I can think of: new spark plug, checked compression, replaced all gas lines, replaced primer bulb, disassembled and cleaned carb, changed gas. Saw will start, but it will only burn the gas from the primer bulb. Throttle works fine, and I can keep the saw going if I gently keep pumping the primer bulb. As soon as I stop, the saw stalls out. Obviously the carb is not pulling the gas from the bulb, but I dont know what else to do.

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  3. #2

    Join Date
    Mar 2012
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    5,221
    Location
    Wisconsin
    Mower
    Toro

    Re: Chain saw starts but stalls after a few seconds

    Need to rebuild the carb with a new diaphragm kit. No one is probably dried out.
    This is only my opinion, and many will say it ain't worth a darn, as I'm only a retired grease monkey instructor and not a professional mechanic. Use what I post at your own risk as you know teachers only know book knowledge.

  4. #3
    okiepc's Avatar
    Join Date
    Feb 2012
    Posts
    517
    Location
    Oklahoma
    Mower
    John Deere

    Re: Chain saw starts but stalls after a few seconds

    1st off next thing how about a brand name and model so we can better help
    Possibly Natures most perfect food, good beef jerky and cold beer
    This old John Deere GX75 just keeps plugging along

  5. #4

    Join Date
    Apr 2013
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    4
    Location
    New Jersey
    Mower
    Toro

    Re: Chain saw starts but stalls after a few seconds

    What happens when the diaphrams get dried out? They let in air that takes away from the fuel line suction?

  6. #5

    Join Date
    Apr 2013
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    4
    Location
    New Jersey
    Mower
    Toro

    Re: Chain saw starts but stalls after a few seconds

    it's a Mac 3200

  7. #6

    Join Date
    Mar 2012
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    5,221
    Location
    Wisconsin
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    Toro

    Re: Chain saw starts but stalls after a few seconds

    Don't know the exact carb you have, (Zama, Walbro, Tilliston) but with any of these the diaphragms and gaskets, (there are both pump and shut off) will dry out and and either not stretch properly or not seal properly. They may look good, but will not function. Another problem customers make when they take them apart, is that they put them back together wrong. If you reverse the gasket and the diaphragm, on either side they will not work.
    This is only my opinion, and many will say it ain't worth a darn, as I'm only a retired grease monkey instructor and not a professional mechanic. Use what I post at your own risk as you know teachers only know book knowledge.

  8. #7

    Join Date
    Apr 2013
    Posts
    4
    Location
    New Jersey
    Mower
    Toro

    Re: Chain saw starts but stalls after a few seconds

    I checked and it is a Zama. I will check to see that the gaskets are in properly, and look for a rebuild kit. Thanks for your help.

  9. #8

    Join Date
    Mar 2012
    Posts
    5,221
    Location
    Wisconsin
    Mower
    Toro

    Re: Chain saw starts but stalls after a few seconds

    This is only my opinion, and many will say it ain't worth a darn, as I'm only a retired grease monkey instructor and not a professional mechanic. Use what I post at your own risk as you know teachers only know book knowledge.

  10. #9

    Join Date
    Mar 2012
    Posts
    5,221
    Location
    Wisconsin
    Mower
    Toro

    Re: Chain saw starts but stalls after a few seconds

    This is only my opinion, and many will say it ain't worth a darn, as I'm only a retired grease monkey instructor and not a professional mechanic. Use what I post at your own risk as you know teachers only know book knowledge.

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