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Stihl BR 550 running very slugish

Discussion in 'Mechanic and Repair' started by Travis E, May 9, 2009.

  1. Travis E

    Travis E LawnSite Bronze Member
    Messages: 1,761

    So lately my BR 550 backback blower has been hard to start and not been able to run full throttle. Finally had a chance to bring it to the dealer for a few days and they thought they had it fixed but still doesn't run hardly at all. Can only run it about about half throttle if that. The dealer is stumped also. A key note is that when the choke is on it runs fine but you can't run the choke and blow the same time cs the choke kicks off when you hit the throttle. So to me that means its not picking up fuel. The dealer recommended trying to back out the carb ajustment to allow for more fuel but still doesn't help. Does anyone know of anything??
  2. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

    Sounds like it could be the welch plug
    Last edited: May 10, 2009
  3. ricky86

    ricky86 LawnSite Silver Member
    Messages: 2,122

    First recommendation is to find a new dealer.
  4. Travis E

    Travis E LawnSite Bronze Member
    Messages: 1,761

    So i researched that quick and found that it seems to be a common problem, although im not really sure what its purpose is?

    They are 100 times better than the one it was purchased through!
  5. KGR landscapeing

    KGR landscapeing LawnSite Bronze Member
    Messages: 1,544

    Dose it run well with a full tank of gas? also did they check the spark screen on the muffler But my first thought would be fuel filter
  6. Josh.S

    Josh.S LawnSite Bronze Member
    Messages: 1,085

    +1 -- This is what cuased BOTH of my FS80s to have similar problems. The screen was clogged completely... just pull that sucker out and don't put it back in... I think they are to protect against forest fires in Cali anyways..
  7. mowerknower

    mowerknower LawnSite Senior Member
    Messages: 766

    Check to make sure the fuel line is not leaking, usually cracks right at the nipple on the tank. Do check the exhuast screen but I would doubt that it plugged. The 4 mix engines run really clean, I have not ever seen one with a plugged exhuast.
  8. Travis E

    Travis E LawnSite Bronze Member
    Messages: 1,761

    Doesn't run well at any stage of fuel run.

    Ok i'll have to check that tomorrow, if it doesn't work then i'm taking it back to Neiderts and let them try again to figure it out.

    The dealer said they checked all the lines.
  9. JAX76CJ

    JAX76CJ LawnSite Senior Member
    Messages: 379

    Travis, I had the same problem with my BR600 when it was brand new. I took it back in and they replaced the Fuel tank "Grommet" (where the fuel lines enter the tank). It ran fine after that. Also, the 4-mix gear doesn't build up carbon as fast in the exhaust, so I don't think that is your issue here. If all else fails, have them put on a new carb. :rolleyes:
  10. Travis E

    Travis E LawnSite Bronze Member
    Messages: 1,761

    I mentioned some of these to the dealer today, he is still thinking its the coil so idk. They only thing he was conserned about was that i had not been running synthetic oil in it untill now but who knows if that caused this or not.

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