Br550 choke knob

Discussion in 'Mechanic and Repair' started by ncknaklawns, Nov 6, 2013.

  1. ncknaklawns

    ncknaklawns LawnSite Senior Member
    from NY
    Posts: 379

    My BR550 choke knob won't stay choked. It just winds back to open position.
    To get it to run I have to hold it choked while I pull the rope. At the same time this happened when I get it started it isn't idling low, just runs like at full thottle once it does start. Trigger is working with the cable to the carb. It all just started now that I really need it for the leaves. Any ideas?:confused:
     
  2. tigerepairdotcom

    tigerepairdotcom LawnSite Senior Member
    Posts: 324

    Take starter off Take blower back cover. (T27 torx screw driver get a long one or the scrench.) Carb removal in this beast can be a bit tricky if you never have done it before. The fuel lines and the throttle cable both go into slots sandwiched behind the air filter housing. Take all off and inspect choke to see why it`s not properly operational. Although I have a feeling your throttle cable is pressed a little bit or a lot "it isn't idling low." Sounds like a kinked throttle cable or not returning. You can disconnect your throttle cable and check choke operation closely and determine the problem. Good luck let me know if you have any more questions. I tripped and stepped on my throttle cable once and it wouln't choke or idle low.
     
  3. ncknaklawns

    ncknaklawns LawnSite Senior Member
    from NY
    Posts: 379

    Thanks for the reply, I'll try in the morning, fortunately its raining so I won't be missed.
     
  4. herler

    herler LawnSite Fanatic
    Posts: 5,144

    Sell the 550, get a 600, problem solved.
     
  5. tigerepairdotcom

    tigerepairdotcom LawnSite Senior Member
    Posts: 324

    It's the same machine with a smaller fan and different name badge. In fact making the 550 slightly more durable.
     
  6. ncknaklawns

    ncknaklawns LawnSite Senior Member
    from NY
    Posts: 379

    Well it was amature hour last time I replaced the fuel line. When I put it back together I didn't feed the throttle cable through the grommets along the bottom that act as strain relief. So after about 3 months I finally must have pulled on the cable enough to cause the problem. It seems to have bent the choke shaft this is why the plastic knob cracked and popped off. It running for now as good as ever but probably should use the stihl fuel lines since these other ones keep cracking (although they are 3/16 ID which is probably to small). My fuel pickup is 7 years old alot of hours probably time for this too. I almost went and bought a 600 which I've been thinking of doing for a while since I only have the one blower. It pushes alot more air at roughly the same speed, so it might not dislodge stuck dirt to pavement much better but will move more product (leaves) faster as long as I can remember to not use full thottle when I don't need to so I don't waste gas. I'll probably get it sooner than later once its in the budget. Thanks for the help.
     
  7. Jeff in AL

    Jeff in AL LawnSite Senior Member
    from Alabama
    Posts: 728

    The only way possible to "bend" the choke shaft is from an inpact... There is no way possible to "bend" the choke shaft otherwise...

    The "fuel line kit" contains both the supply and long return line which is part number 4282 007 1014, it also contains instructions.

    The "fuel filter" is part number 0000 350 3502. If your unit 2 fuel filters then use 1 of the prior number and 1 of 0000 350 3514 which is a double barbed filter. (I assume when you said the fuel filter is 7 years old, you will have the original version which only used the one fuel filter unless it has been updated).
     
  8. recycledsole

    recycledsole LawnSite Gold Member
    from MD
    Posts: 3,231

    Mine does this when I leave the thumb trigger to lock mode
     
  9. ncknaklawns

    ncknaklawns LawnSite Senior Member
    from NY
    Posts: 379

    The machine does get thrown around a little. Not sure shaft was actually bent now just that the plastic knob broke off and it seams to impact the plastic housing now although I need to get a new one to give the long nose a break. The strain relief was the whole problem. Thanks for the part numbers. Might gorilla glue the old choke knob if a new one is over $5 bucks.
     

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