Blower bogging when choke is off

Discussion in 'Mechanic and Repair' started by themow, Feb 13, 2007.

  1. themow

    themow LawnSite Member
    Posts: 41

    Ran fine for a year or so. Seems it may have started when this cold spell started. It runs great with the choke on half way. As soon as i take the choke off, it bogs. No smoke though. I cleaned the air filter and changed the plug. I pulled the carb and found no dirt. Im assuming the high speed jet may need an adjustment due to the cold.

    The bogging is a symptom of it running rich but theres no smoke at all. As soon as i choke it, its revs back up.
     
  2. Team Green L&L

    Team Green L&L LawnSite Member
    Posts: 5

    I had the same trouble with an echo hedge trimmer. I rebuilt the carb, new gaskets, plunger, spark plug etc. It still bogged down and died when you pulled the throttle trigger. I finally broke down and took it to a shop and they said it was because the muffler was actually gunked up not letting the exhaust escape. They took the muffler off and took a torch and burned it out. Runs fine now, may want to try that. Cost me $72.00 to learn that.:dizzy:
     
  3. MowerMedic77

    MowerMedic77 LawnSite Bronze Member
    Posts: 1,164

    First let me Welcome you to Lawnsite :drinkup:

    Second your above statement is off, the unit is actually giving you a lean run issue since choking it richens the fuel mixture. Along with checking for carbon buildup you may also want to check the in-tank fuel filter(if discolored in any way replace) and inspect your fuel lines for small cracks and pin holes that may be allowing your unit to suck air and run lean.
    Hope this helps:)
     
  4. John Gamba

    John Gamba LawnSite Fanatic
    from ct
    Posts: 10,812



    this is it:)
     
  5. lawnboy dan

    lawnboy dan LawnSite Gold Member
    Posts: 3,712

    check exauast screen
     
  6. dutch1

    dutch1 LawnSite Silver Member
    from Jayhawk
    Posts: 2,231

    What has been mentioned above is all valid. My procedure on all 2 cycle equipment with this symptom is to replace in tank fuel filter, plug, clean air filter, remove and clean/discard anti spark screen, remove muffler and clear exhaust port in jug(I have seen ports you couldn't pass an 1/8" drill bit through). If this doesn't clear up the boggy condition, with the unit running I squirt a flammable carb/choke cleaner around the isomount between the carb and block. If the rpm's rise you likely have a small crack in the isomount, thereby not allowing proper air/fuel for good running. If the compression is adequate and everything else has been done then it's time to rebuild the carb.

    In addition, when you have the muffler off, carefully inspect the condition of the cylinder and piston. Units with carbon stuck ring(s) and galled jugs will act much like what has been described. With units in this condition, if you can do the work yourself, money can be saved. If you have to have it shop repaired it is usually not cost effective as the repair bill will be more than half the cost of a new unit.

    In my experience, upon questioning customer of their use of 2 cycle equipment, the most significant contributor to plugged ports and antispark screens is excessive running of equipment at slow speeds. At slow speeds you do not get the unit hot enough to more completely burn up the oil in the fuel.

    That's my 2 cents worth.

    Dutch
     
  7. themow

    themow LawnSite Member
    Posts: 41

    thanks for all the replies. Im gonna pull the muffler and check the spark arrestor and check out the fuel filter.

    I must have been misinformed about lean/rich ratios forever.
    I always thought

    Rich= too much gas/not enough air/bogs motor

    Symptom dirty air filter/ poorly adjusted carb

    Lean=too little fuel too much air/ motor revs high, runs hot and burns up motor.

    Symptom poorly adjusted carb or dirt in there.

    Where am i wrong

    thanks again
     
  8. John Gamba

    John Gamba LawnSite Fanatic
    from ct
    Posts: 10,812

    It sounds like you have a clogged carb"clogged fuel jet". Let us know what you find.
     
  9. rebarn

    rebarn LawnSite Member
    Posts: 4

    You are close either too rich or to lean and motor runs poorly ,if at all . If richness was the problem then choking it would worsen it.
     
  10. MowerMick

    MowerMick LawnSite Member
    Posts: 12


    Rebarn is correct.
     

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