Coughing & sputtering in the rough stuff

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by marcwestbmw, Aug 13, 2013.

  1. marcwestbmw

    marcwestbmw Walkin' Mans Friend

    Joined:
    Jan 26, 2006
    Oddometer:
    491
    Location:
    Gulf Coast Alabama
    2006 950 ADV S, 10,000 miles

    Started the bike one day after it had been sitting for 3 weeks (ethanol fuel in the tanks). Fuel poured out of the carb vent for a seconds. Bike subsequently ran fine, until later in the day , when I got in the rough stuff. Now, on slow speed acceleration, hard turning, or riding on rough terrain, the bike coughs and sputters.

    I have added fresh fuel, run Seafoam through it, and still doing the same thing. My plan is to remove the carbs, clean the bowls, and put in fresh jets. Am I on the right track?

    BTW, could it just happen to be the fuel pump. The points are worn unevenly. But, not worn all the way through.
    #1
  2. Balsta

    Balsta Been here awhile

    Joined:
    Feb 11, 2008
    Oddometer:
    400
    Location:
    Chilly Northern Europe
    Ruled out side stand switch?
    #2
  3. marcwestbmw

    marcwestbmw Walkin' Mans Friend

    Joined:
    Jan 26, 2006
    Oddometer:
    491
    Location:
    Gulf Coast Alabama
    Side stand switch is off and wired together. But, I haven't check it since I did the torque limiter. Hmmm.....which was right before this all started.
    #3
  4. bomose

    bomose Long timer

    Joined:
    Jul 22, 2007
    Oddometer:
    1,972
    Location:
    Dixie
    Check the spring in the float needle. A friend had the same thing happen on his KLR. Ran good on smooth stuff, but hit the rough stuff and it would sputter. Freed that up and it ran fine.
    #4
  5. homerj

    homerj 742 Evergreen Terrace

    Joined:
    Apr 11, 2005
    Oddometer:
    5,885
    Location:
    742 Evergreen Terrace
    clean the whole carb. I've had similar issues, used seafoam, and didn't see a difference. pulled the carbs, cleaned them, reassembled and all OK.

    as for the fuel pump, if you're nearly full tanks when then happens it's less likely to be the fuel pump.
    #5
  6. pfdskipper

    pfdskipper Westside Trash

    Joined:
    May 15, 2009
    Oddometer:
    1,281
    Location:
    Litchfield Park, Az
    Check your float level while you have the carbs out for the cleaning. Probably a debris related issue but they will sputter and cough if the bowls aren't properly filling.
    Don't forget to take a look at your filters as well.
    The leaking fuel was most likely a dried out o-ring, should be ok once saturated and plumped up.
    #6