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Echo PB755H bog issue

Discussion in 'Mechanic and Repair' started by Stinson Landscape, Apr 4, 2013.

  1. Stinson Landscape

    Stinson Landscape LawnSite Member
    Messages: 38

    I have an echo pb 755H blower that when run at full throttle it will bog as if its loosing spark. It only does it after about 10 to 15 mins of use, then will continue every 5 to 10 mins give or take. Issue started the end of last season, thought I had it fixed with a new coil and boot, but its still there.

    Background info:

    -new intake gaskets
    -new coil and boot (issue was there before new coil)
    -newer plug
    -exhaust clean
    -was bought brand new in either 07 or 08 (still seems like it runs strong even with the issue)

    tired running with kill switch disconnected, still ran the same.

    Anyone have any ideas?
  2. camshaft49

    camshaft49 LawnSite Member
    Messages: 21

    I think its a fuel issue more thab spark give the carb a good cleaning
  3. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 14,456

    I ASSUME YOU put a new fuel filter in the unit? If tha don't fix it then adjust the and give it more gas CCW. I also assume your air filter is clean and not saturated with fuel.
  4. Stinson Landscape

    Stinson Landscape LawnSite Member
    Messages: 38

    Going to pick up a fuel filter tomorrow and try that. Air filter is clean.
  5. Landrus2

    Landrus2 LawnSite Fanatic
    Messages: 5,021

    Make sure the fuel tank cap inlet valve is working properly, this will allow a vapor lock if it is not. Then check the fuel line in tank to make sure the pickup filter is not hung up in tank thereby allowing the fuel to get below the pickup. Also check the fuel line for holes. :waving:
  6. Stinson Landscape

    Stinson Landscape LawnSite Member
    Messages: 38

    Thanks Landrus, ill check those areas also.
  7. WarrenRaymond

    WarrenRaymond LawnSite Member
    Messages: 11

    You stated that your exhaust was clean. I run a rich mix of oil and gas in my equipment which clogs the exhaust screen after a while. This starts off as a slight bogg from time to time under full throttle and gets worse. I usually remove the screen and clean out the muffler. Try removing the screen and running it to see if there is any difference, I have also removed the muffler and run mine to be sure. The exhaust on that model may also have baffles in it which could be clogging. The coil issues are usually intermittent and show up when the unit gets hot and can go in and out from running fine to loosing power. Once the unit would cool down it would run fine again, thus leaning toward a coil issue.I hope this helps.
  8. Stinson Landscape

    Stinson Landscape LawnSite Member
    Messages: 38

    Changed the fuel filter, breather cap and gas cap gasket and she's runs like a champ. Thanks for the help everyone!
    Posted via Mobile Device
  9. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 14,456

    I don't have my 755 close but don't it have the same breather that all the other have....the little white canisor with cap on it?
  10. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 14,456

    You might want to figure out where the carb adj is and get the tool or you will be back soon

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