What now? Sputtering, stalling

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by DakarNick, Oct 9, 2012.

  1. garmei

    garmei Adventurer

    Joined:
    Sep 22, 2009
    Oddometer:
    90
    Location:
    uk
    I've had similar problems that were caused by dirty electrical connections off the fuel pump wiring...
    #21
  2. Orangecicle

    Orangecicle On a "Quest"

    Joined:
    Apr 24, 2007
    Oddometer:
    3,976
    Location:
    West Des Moines, IA
    Well, I'll offer my 2 cents. Gas engines need fuel, air, and electricity to run. You're missing one of the three. So, I'd install a simple voltage meter to make sure you aren't having an odd intermittent electrical problem. Note that some have had intermittent electrical failures at the starter relay:

    (pic borrowed from Aurel's thread)
    [​IMG]

    Pyndon had that problem for 10,000 kilometers or so. I can't imagine that's your problem, but it's an easy thing to check.

    If it's not a volts problem, it's air or gas. I'm betting it's gas. That means gas is not getting to the fuel pump or the fuel pump is running into problems. Consider pulling the fuel shutoff valve and draining the tank to make sure you don't have a problem there. We once had a tractor on the farm with a rag in the tank that just about drove everyone insane.

    If the problem's not in the tank, I'd make sure there is no other restriction that is causing a problem, such as an overly restrictive fuel filter or a severe bend in the line that might cause a fuel delivery restriction. I've had crap like that show up only when the bike is hot and the line limbers up.

    If it's none of that, the next best place to look is the pump. I doubt it's the carbs because crap will get in one bowl or the other and you get a crap running bike, not a starving bike. Try a Facet pump if the vacuum pump is not working out. They seem to work well. Works on my bike. http://www.advrider.com/forums/showthread.php?t=315948

    My Facet. Two years on and going strong:

    [​IMG]

    Best of luck.
    #22
  3. DakarNick

    DakarNick Swabee

    Joined:
    Oct 14, 2005
    Oddometer:
    7,530
    Location:
    Parker, Colorado
    Thanks guys, I appreciate it. I will work on it today. I do have an inline filter installed. I'll remove that first and check for any restricted or kinked fuel tubing. I'll then check the tanks, though last time I had it apart the tanks and tank screens were clear.

    I will probably get a pressure gauge and check the fuel pressure just go get an idea. A on-board digital voltmeter is something I'll more than likely add, also.
    #23
  4. homerj

    homerj 742 Evergreen Terrace

    Joined:
    Apr 11, 2005
    Oddometer:
    5,792
    Location:
    742 Evergreen Terrace
    Nick, every time you cleaned the ignition switch this started acting normal? I had something similar happen to me and it came and went just like you're having. it ended up being the ignition switch.

    Try this from the HOW:
    cpmodem: In the case of a broken ignition switch, lost key, or broken switch wires, it is fairly simple to "hotwire" the 950 Adventure (2003-2006). In the fuse box inside the glove box, simply jumper the Acc1 fuse to the Ignition, Headlights, and Instruments fuses (right three). Make up the jumper ahead of time and keep it on the bike for emergencies. Use a minimum of 2mm (14 AWG) insulated wire for your jumper. Be sure to connect the right three first. Leave the fuses in place and your circuits will be protected as usual. There is no additional load on any wiring as the jumper simply replaces the ignition switch in the circuit. The branch circuits remain un-altered. Jumpering to the other side (bottom side) will leave the circuits unprotected and may cause smoke to escape from the wires.

    I ended up putting a switch on the constant 12V supply so I could turn the bike off. The nice thing about this test is it's cheap, and takes about 20 min to put into place.

    if you end up diagnosing the ignition switch as the culprit buy a new switch, separate the electricals from the key tumblers, and put the new electricals on the old key tumblers so you don't have to re-key the rear seat release.
    #24
  5. Ducky 149

    Ducky 149 Been here awhile

    Joined:
    Oct 20, 2006
    Oddometer:
    436
    Location:
    Roswell Jawja
    Hi, Please also check gas caps for proper venting. They need to be able to suck air in. Have chased my tail on this before. Easy check is to open gas cap as it is happening and see if it clears up. Also listen for a Whoosh of air as it enters the tank(s).

    Ducky
    #25
  6. DakarNick

    DakarNick Swabee

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    7,530
    Location:
    Parker, Colorado
    I did the flapendectomy on the caps.
    #26
  7. DakarNick

    DakarNick Swabee

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    Oct 14, 2005
    Oddometer:
    7,530
    Location:
    Parker, Colorado
    Awesome, Jack, thanks. I'll build a jumper and test it out. I put a WTB ad in the FM Parts forum for a new switch.
    #27