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Briggs and stratton 4.5 hp ( 10G902 ) starts great but after a couple seconds starts to stumble. i have replaced the plug, gas and cleaned the air filter. I tried a couple things like spraying carb cleaner in the ''carb'' opening, waiting 15 minutes then poking a bread bag tie into the small hole. no luck getting the stumbling to go away. it was running fine when this started during a mowing episode. any help would be greatly appreciated, thanks

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Try draining the carb and gas tank into a small plastic bowl and look for water in the fuel. I you have a diaphragm type carb it might just need a new diaphragm and spring.

Did the stumble start right after refueling? If so then your gas can may be carrying some water too. It happens. I have seen gas can with INCHES of water in the bottom! True story. I went to a customers house after she had both her walk behind and rider stop running. She said both were fine until she refueled and then...no start. I looked at her gas can and it was terrible!

If you are trying to clear the main jet you need to get inside the carb and clean from the fuel inlet side. Bowl carbs usually have removeable jets that you can look through.

Good luck and be careful!

Posted on Jul 13, 2010

  • 6 more comments 
  • qwkstng Jul 13, 2010

    Thank you for your time in responding!
    it started about 45 minutes into mowing and i hadnt refueled. i had tried draining the fuel tank. I could not get it completely drained but i did use fresh gas when i refueled and tried again.

    yesterday i completely tore the whole fuel tank, carb and plastic (grey) cross tube apart and cleaned everything. i didnt see anything wrong with any of it ... but it started and ran like it should for 5 minutes ... so i am assuming that its fixed. i did completely drain the fuel tank this time.

    thank you again for your time!

  • qwkstng Jul 13, 2010

    Thank you for your time in responding!
    it started about 45 minutes into mowing and i hadnt refueled. i had tried draining the fuel tank. I could not get it completely drained but i did use fresh gas when i refueled and tried again.

    yesterday i completely tore the whole fuel tank, carb and plastic (grey) cross tube apart and cleaned everything. i didnt see anything wrong with any of it ... but it started and ran like it should for 5 minutes ... so i am assuming that its fixed. i did completely drain the fuel tank this time.

    thank you again for your time!

  • qwkstng Jul 13, 2010

    Thank you for your time in responding!
    it started about 45 minutes into mowing and i hadnt refueled. i had tried draining the fuel tank. I could not get it completely drained but i did use fresh gas when i refueled and tried again.

    yesterday i completely tore the whole fuel tank, carb and plastic (grey) cross tube apart and cleaned everything. i didnt see anything wrong with any of it ... but it started and ran like it should for 5 minutes ... so i am assuming that its fixed. i did completely drain the fuel tank this time.

    thank you again for your time!

  • qwkstng Jul 13, 2010

    Thank you for your time in responding!
    it started about 45 minutes into mowing and i hadnt refueled. i had tried draining the fuel tank. I could not get it completely drained but i did use fresh gas when i refueled and tried again.

    yesterday i completely tore the whole fuel tank, carb and plastic (grey) cross tube apart and cleaned everything. i didnt see anything wrong with any of it ... but it started and ran like it should for 5 minutes ... so i am assuming that its fixed. i did completely drain the fuel tank this time.

    thank you again for your time!

  • qwkstng Jul 13, 2010

    Thank you for your time in responding!
    it started about 45 minutes into mowing and i hadnt refueled. i had tried draining the fuel tank. I could not get it completely drained but i did use fresh gas when i refueled and tried again.

    yesterday i completely tore the whole fuel tank, carb and plastic (grey) cross tube apart and cleaned everything. i didnt see anything wrong with any of it ... but it started and ran like it should for 5 minutes ... so i am assuming that its fixed. i did completely drain the fuel tank this time.

    thank you again for your time!

  • qwkstng Jul 13, 2010

    Thank you for your time in responding!
    it started about 45 minutes into mowing and i hadnt refueled. i had tried draining the fuel tank. I could not get it completely drained but i did use fresh gas when i refueled and tried again.

    yesterday i completely tore the whole fuel tank, carb and plastic (grey) cross tube apart and cleaned everything. i didnt see anything wrong with any of it ... but it started and ran like it should for 5 minutes ... so i am assuming that its fixed. i did completely drain the fuel tank this time.

    thank you again for your time!

  • qwkstng Jul 13, 2010

    Thank you for your time in responding!
    it started about 45 minutes into mowing and i hadnt refueled. i had tried draining the fuel tank. I could not get it completely drained but i did use fresh gas when i refueled and tried again.

    yesterday i completely tore the whole fuel tank, carb and plastic (grey) cross tube apart and cleaned everything. i didnt see anything wrong with any of it ... but it started and ran like it should for 5 minutes ... so i am assuming that its fixed. i did completely drain the fuel tank this time.

    thank you again for your time!

  • qwkstng Jul 13, 2010

    Thank you for your time in responding!
    it started about 45 minutes into mowing and i hadnt refueled. i had tried draining the fuel tank. I could not get it completely drained but i did use fresh gas when i refueled and tried again.

    yesterday i completely tore the whole fuel tank, carb and plastic (grey) cross tube apart and cleaned everything. i didnt see anything wrong with any of it ... but it started and ran like it should for 5 minutes ... so i am assuming that its fixed. i did completely drain the fuel tank this time.

    thank you again for your time!

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