problem with stihl backpack blower-losing power

Discussion in 'Mechanic and Repair' started by Eho, May 23, 2005.

  1. Eho

    Eho LawnSite Member
    Messages: 205

    I got a Stihl backpack blower at the start of this season which I really loved. Over the past week, I ve noticed to power is WAY down. I d say the power is half of what it was when running great. I looked at the manual and tried what it suggested. I checked the air filter and it was really clean, and I played with the carburetor as it suggested and it still doesnt run well at all. Its reallly frustrating that my new piece of equipment is having problems. Anything else I can try? Please help me
  2. Zr2_thunder

    Zr2_thunder LawnSite Member
    Messages: 22

    You might have already done it or not but if you havent yet try changing your spark plug, they tend to get dirty quick with 2 cycle engines and that would definatly give you loss of power.
  3. herb_nc

    herb_nc LawnSite Member
    from nc
    Messages: 6

    Might also check the spark arrestor attached to the muffler - make sure it is'nt clogged up w/ carbon deposits. This was the cause of my BR-400 running poorly some time back.
  4. Jpocket

    Jpocket LawnSite Silver Member
    Messages: 2,282

    Spark arrestor...pull it out
  5. jpp

    jpp LawnSite Silver Member
    Messages: 2,131

    I agree it probably is the spark arrestor but clean and keep it in. Especially since you live down in Texas where it could get very dry.
  6. topsites

    topsites LawnSite Fanatic
    Messages: 21,652

    I have a Br420/c and a br550, on both of them I noticed the throttle cable likes to come lose near the carburetor, especially when they come straight from the mfg. What then happens is even thou you're giving it full throttle, the cable slips at the other end and you hardly get any response.
    Fix it by leaving the throttle in the idle position, tighten it real good and it will never come lose again.
  7. Eho

    Eho LawnSite Member
    Messages: 205

    cleaned the spark arrestor and it runs like new now!
    EHO :)
  8. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 14,690

    I am surprised that the spark arrestor was clogged this quick, is this a 4mix unit? Are you using stihl oil?
  9. Eho

    Eho LawnSite Member
    Messages: 205

    It is not a four mix unit and I wasnt using stihl oil. A customer of mine gave me a ton of two cycle mix last year that he got through his job somehow. I use this and it has worked fine over the past year with all my equipment. I do have some echo equipment too so I figured using the stihl oil wouldnt matter too much. Do u think this might have caused the problem? How often to they usually get dirty? It only took about 2 months of use and the spark arrestor looked very dirty
  10. kc2006

    kc2006 LawnSite Silver Member
    Messages: 2,443

    I asked about this when i bought a br550, the dealer said I could run any good quality oil and it would be fine. Echo, shind, stihl he said they'll all work fine.

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