Question about Parks Optical 13.5hp Briggs And Stratton Intek Lawn Mower Engine

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Briggs&Stratton 4.5hp seeking/hunting

Model 10G902-0171-B1-02120254.

I removed/cleaned the carb and tank and cleaned the air filter and it has a new plug. New fuel for this season. It runs great for about five seconds then gradually starts to seek/hunt. It's very pronounced. The engine dies while slowing down, then revs back up. I have a video where you can see the little dealie, behind the carb, moving back and forth.

It will gradually run worse and worse over about two minutes before dying. It seems to like running best when I lift it up, by pushing down on the handle.

If this site will let me post a video, I will give you the link. Audio is terrible... cell phone. Otherwise, I will post it on YouTube and tell you what to search for, to find it easily. This is really annoying because my lawn is getting huge/out-of-control/embarrassing.

Search for these tag words, on YouTube:
ASDFG B&S mower surging/seeking/hunting

Posted by on

  • dbuschhorn May 17, 2009

    I cleaned the screens, with air but they were pretty clear to begin with. Will try the diaphragm. Is that at the other end of the arm that I can see slowly moving back and forth while the mower is seeking?

  • dbuschhorn May 17, 2009

    I just ordered it. Part number has changed but It's all good. Will let you know if it works :)



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Did you replace the pump diaphragm and gasket between the carb and fuel tank? There is also a screen on the carb and a secondary pickup 'hole' on the fuel tank that needs to be cleaned between them too. You'll see that when you take the carb off the tank.

Posted on May 17, 2009

  • 1 more comment 
  • Dwain Pippen May 17, 2009

    Remember when you replace the pump diaphragm to put the rubber diaphragm against the fuel tank and the gasket on TOP next to the carb

  • Dwain Pippen May 17, 2009

    No. You have to remove the fuel tank and carb. Then, unscrew the carb from the fuel tank and pull them apart. Then you will see what I was talking about in the last posts. You will have to buy diaphragm part #495770

  • Dwain Pippen May 17, 2009

    Cool. That usually works on those engines. Slip the screen off the pickup on the carb and clean it and the chamber it fits into and remember the rubber diaphragm goes against the tank. Let me know how it works out.. Dwain



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Briggs part #495770

1. Remove the air filter assembly. This is a good time to clean and re-oil the filter.
2. Remove the 3/8" head bolt from the front of the fuel tank.
3. Remove the 1/2" head bolt from the side of the fuel tank.
4. Gently pull the fuel tank assembly toward you and tilt it away from you. While doing this, you will need to unhook the governor wire from the throttle plate.
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13. Reinstall the tank/carb assembly. Make sure you hook up the governor linkage.
14. Inspect the governor spring(s). They should be connected on both ends. You should not disconnect them for this repair.
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