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Echo Pb770

Discussion in 'Mechanic and Repair' started by Androyy, Oct 5, 2010.

  1. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 14,442

    Ok both the 770 and this 265 have adjustment needles on the carb. you must find them. And the ports get clogged on 265 with heavy use. The fuel is not a factor it is all in these adjustment. They are hid behind plastic plugs that can be pulled out.
  2. Androyy

    Androyy LawnSite Member
    Messages: 66

    Where are these plastic plugs located? The only place.I have heard about adjusting newer carbs is where the throttle cable.connects to on the carb.. if you look down at the little " brass" screw in there.. sometimes they are adjustable from that point
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  3. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 14,442

    Yep that is it you have to have a D shaped device and I don't know what that is called but it is a standard tool. Now on the trimmers there is an addidional needle straight in from the back. Both of them use small screw driver after you get the plug out. Some heat up a spring hook plungs it into the plastic let it cool then pull. I have a reverse screw device to get them out don't know where to get em since dealer gave me one.
  4. bvillefarm

    bvillefarm LawnSite Member
    Male, from Batesville,IN
    Messages: 32

    If adjusting the carb does not work, replace the white check valve for the fuel tank. Had trouble with 2 PB770, I adjusted carbs, replaced carbs, nothing worked. Replaced the check valve, worked perfect. One easy way to tell is if you crack the gas cap just a little bit and you can hear air forced out of the tank, check valve is bad.
  5. Bumpmaster

    Bumpmaster LawnSite Fanatic
    Messages: 20,504

    Guess the mechanics said there was dirt in the carb, have no idea how that could of happened but it has been working great for at least one day.
  6. WorldsStrongestLandscaper

    WorldsStrongestLandscaper LawnSite Member
    Messages: 243

    I just took my carb completely apart. Mine went from running only on low idle to running ok (75%) on half choke. So I fixed half the prob. Where is this check valve located? And I also can't find this adjustment screw under the cap you guys are talking about. Lmk thx
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  7. Darryl G

    Darryl G Inactive
    Messages: 9,500

    I live on the shore so went down and scouped up some of the foam that gathers on the surface of the water near the stone jetty at the town beach and put it in one of my trimmers that has been bogging down a lot. Now it won't run at all. That's the last time I'm ever putting sea foam in any of my equipment!!!!
  8. echoman4

    echoman4 LawnSite Member
    Messages: 9

    What he said. In my review of the echo pb770T, I noted the following:

    • After cleaning / rebuilding carb (as needed) and replacing the gas filter, spark plug and air filter
      I removed the spark arrestor on the muffler
      I tweeked the fuel metering lever (bending it slightly upwards) for a richer fuel mixture.
      This is almost required due to the power lost with a 10% ethanol blend in the fuel
      Then what Mac B posted: You can buy the "D" shaped echo screwdriver online and adjust the high speed fuel jet yourself or have a dealer do it. On mine, I opened this screw about 1 full turn. This jet is easily reached without removing the protective shroud. Look slightly upwards from the primer bulb. I forget if there was a protective plastic cap over the screw, but you can get in there fairly easily with the "D" screwdriver. After doing all that, the unit runs flawlessly.
      I use only 91 octane super gas, occasionally add Seafoam,
      Oh, and do add some stabil to your gas, especially if you're not using it very often.
  9. Jimslawncareservice

    Jimslawncareservice LawnSite Platinum Member
    from mn
    Messages: 4,143

    mine did this for the first time this fall. I used 1/3 can of seafoam maybe a tad more. figured out where it ran best on the choke. maybe 20 or so minutes. it started to run rough and died. I started it with no choke. it has ran like new since
  10. Mike A

    Mike A LawnSite Member
    Messages: 74

    I sure am glad I don't live close to the ocean!
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