McCulloch Trimmer dies

Discussion in 'Mechanic and Repair' started by Joe P, Jul 1, 2006.

  1. Joe P

    Joe P LawnSite Member
    Posts: 11

    Hi Guys
    1st timer here. I've got a McCulloch Eager Beaver 282 curved shaft trimmer, older model, Walbro WT231A carb. It starts OK (6-7 pulls; it took 3-4 when new) but slowly dies when not kept at high throttle setting. I like to trim at virtual idle, so this is a problem. I adjusted the idle speed screw to its highest setting, but this hasn't helped. I am wary of tinkering with the high and low speed adjustment screws, because I don't know what I'm doing. I've been looking for an online guide to adjusting these, to no avail.
    Question: Will I be able to adjust the H/L speed screws to fix this? Where can I find a guide? (McCulloch is out of business, Walbro site doesn't seem to help).
    Question: Trimmer is 13 years old, but has less than 200 hours on it and is in otherwise good shape. Do I need a carb rebuild (old rubber) or new fuel lines (old plastic) as suggested in other threads with similar problems? Again, where can I find instructions to do a rebuild?

    Thanks for your help!!

    Joe
     
  2. MowerMedic77

    MowerMedic77 LawnSite Bronze Member
    Posts: 1,164

    First thing I would do is check for carbon in the exhaust port/muffler since you say you trim at near idle then the engine never gets to full temp and probably does'nt burn off your 2cycle mix completely and after 13 years of running it like this I would start there. Most people don't own a car for 13years so :clapping:congrats.
     
  3. Joe P

    Joe P LawnSite Member
    Posts: 11

    Yes, checked for that - exhaust port a little gunky, but not at all restrictive. I tried to run it without the muffler, and other than being louder, it ran exactly the same.
     
  4. TURF DOCTOR

    TURF DOCTOR LawnSite Silver Member
    Posts: 2,138

    Try a new plug,clean the breather and fresh fuel on old trimmers it's common.
     
  5. Joe P

    Joe P LawnSite Member
    Posts: 11

    Will try a new plug. Breather was cleaned, fuel is fresh. But could a plug really be the problem? Trimmer works fine at full and at 1/2 throttle. Problem with idle only. I thought plugs either worked or not, no middle ground.
     
  6. TURF DOCTOR

    TURF DOCTOR LawnSite Silver Member
    Posts: 2,138

    Perhap's not to insult you but cheap trimmer's it's common.
     
  7. dutch1

    dutch1 LawnSite Silver Member
    from Jayhawk
    Posts: 2,231

    If it has a intank fuel filter, was that checked? Mac is one of the box store throwaway lines so taking it to a shop is not cost effective, in fact that I use to work in wouldn't take in anything we didn't sell. Recoils an carburetors are often tough to get to quickly and parts are often hard to come by.

    If you must rehabilitate the Mac, first check the compression and if it is not over 100 psi I wouldn't bother with it. Second, if it is starving for fuel, replace the fuel lines and filter, rebuild the carb with a new kit after properly cleaning it. Reinstall, then run both high and low speed screws in till snug then back them out one and a quarter turns. If you can get it to start, adjust the low speed so that it idles properly then adjust the high speed screw with the engine wide open so that you get a gurgling noise which will indicate that it is running just a little on the rich side so that you get proper lubrication from the oil mix. Running lean does not give proper lubrication.

    When you take the carb apart to rebuild, take notice of the location and order of the gaskets and diagphram so that they can be replaced in the proper order. It is also recommended that you have the proper needle lever height. To do so you will need the proper Walbro or Zama gauge tool to accomplish the task.

    You might check to see it the carb is presently tight to the engine block and that you are not getting an air leak I recently worked on a Homelite that had both both carb retaining screws loose.

    If after reading this and you get your mission accomplished you will have a better appreciation of why an estimate from a shop exceeds the cost of another economy trimmer, particularly if you replace the recoil rope as well.

    Dutch
     
  8. Joe P

    Joe P LawnSite Member
    Posts: 11

    Thanks, Dutch.
    Absolutely this is a cheap economy trimmer, not worth taking in to a shop. That's why I'm tinkering with it myself. Thanks for the tip on adjusting the H/L speed screws. Will also check for a fuel filter in tank. Is it pretty straightforward to rebuild a Walbro carb? I've never done it, and don't have the gauge tool.
     
  9. dutch1

    dutch1 LawnSite Silver Member
    from Jayhawk
    Posts: 2,231

    It's reasonably simple. Keep parts/gaskets/diagphram is order as they come off. Replace fuel screen(usually included in kit), remove adjustment screws(again noting location of each as they are different usually) and blow carb/choke cleaner through ports. Reassmble in proper order and you should be good to go.

    Dutch
     
  10. Joe P

    Joe P LawnSite Member
    Posts: 11

    BTW, does anyone know what to set the gap on the new plug for?
     

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