Problem with Echo PB-755H

Discussion in 'Lawn Mowing' started by jloveski, May 1, 2011.

  1. jloveski

    jloveski LawnSite Member
    Messages: 6

    I have a PB-755H that starts as normal, but will not run without stalling much above a fast idle. I have never been thrilled with this model, but this is crazy. Any ideas on what may be causing this? Hate to bring it into the shop if it is something minor.

  2. Alan0354

    Alan0354 LawnSite Platinum Member
    Messages: 4,450

    Take the muffler out and clean the port, clean the screen on the muffler. Then see what happens.
  3. jloveski

    jloveski LawnSite Member
    Messages: 6

    I tried that, but it did not help-seems more like a carb issue?
  4. kietsterz

    kietsterz LawnSite Member
    Messages: 12

    i have the same issue with mine. I just have to move the choke up and down while cranking it up at the same time to find the right spot.
  5. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    Air filter and spark plug, gap to .020

    And it may not fix the problem but lets at least eliminate these off our list.
  6. Alan0354

    Alan0354 LawnSite Platinum Member
    Messages: 4,450

    Loosen the gas cap and see whether it help. ( remote chance of cap having problem).

    Change the gas filter to make sure the gas filter is not the problem.

    run a tankful with at least 2 oz of SeaFoam per gallon gas.

    If all the above fail, then you are talking about carb overhaul. Don't jump the gun too fast.

    yes chances are your carb might be the problem, but it might be clean itself up with SeaFoam if you have the patience.
  7. BrunoT

    BrunoT LawnSite Senior Member
    Messages: 741

    Mine did that. Tried the various fixes above and a few others to troubleshoot it. Finally just replaced the carb with one off an older model that had seized up. Worked fine since then. New carbs are not that expensive, so unless you are skilled at rebuilding them it might be easier to just pop a new one on.

    But to make sure that's the issue, try one from another identical unit if you have one. (another reason to stick with the same brand and model gear, it helps with troubleshooting)
  8. jetta

    jetta LawnSite Member
    Messages: 223

    took mine to several dealers before i found one that would overide the factory (epa) settings never ran better after that
  9. FuturePilot4u

    FuturePilot4u LawnSite Senior Member
    Messages: 377

    I run seafoam in every tank all the time. It helps a lot.
    Posted via Mobile Device
  10. jetta

    jetta LawnSite Member
    Messages: 223

    i was told to run 89 octane and no sea foam as stabilizer is in the oil, and the 89 now days has enough additives. too much additive is not good.

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