Echo PAS-266 revving up

Discussion in 'Mechanic and Repair' started by LLCllc, Apr 10, 2014.

  1. LLCllc

    LLCllc LawnSite Member
    Messages: 12

    I have an echo pas-266 (s/n t44312001696) that has an rpm issue. After about 5 min. of use, its revs up real high. Sounds like it an r/c engine that is lean. I can let off the throttle and it will return to normal, but will rev back up within 30 sec of getting back on the throttle.
  2. LLCllc

    LLCllc LawnSite Member
    Messages: 12

    Oh yea, it happens with the straight shaft edger attachment or the articulating hedge trimmer attachment.
  3. spydahead

    spydahead LawnSite Member
    Messages: 30

    Sounds like you have a air leak, make sure everything is tight carb,manifold,ect, then start looking for split hoses, be careful because
    what ever it is, its causing a very lean condition and if you keep runn'in
    it, its go'na melt that piston eventually.
  4. herler

    herler LawnSite Fanatic
    Messages: 5,139

    Probably either a crack in a fuel line or possibly the primer bulb, also could be the carburetor-to-intake gasket or... Something as dumb and simple as the nuts that hold the carburetor could need tightening up a bit. Not sure if a loose spark plug could cause this, but all this and more is certainly worth checking into as I agree with the air leak analysis.
  5. LLCllc

    LLCllc LawnSite Member
    Messages: 12

    Thanks for the quick replies. I will check all of that this weekend.

    I did remember something else that is probably significant; The primer bulb is slow to refill/return to normal shape after pressing it. Is this a problem with one of the diaphragm valves not operating properly?
  6. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 14,366

    How old is this unit?
  7. LLCllc

    LLCllc LawnSite Member
    Messages: 12

    About 2yrs old
  8. herler

    herler LawnSite Fanatic
    Messages: 5,139

    Well, if all else fails one could always replace the carburetor but I order primer bulbs by the 12-pack as I replace them frequently.

    Not saying that's going to solve the problem, but fuel lines and primer bulb are first for me.
    Especially surging...

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