Question about Harley Davidson Burgman 125 G Motorcycles

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2005 sportster 1200 carb stops after running awhile won't start until sits for bit seems like front cyl miss firing before stopping

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  • Barry  Meldrum
    Barry Meldrum May 30, 2011

    Thanks Steve, I already checked the diaphram and appeared ok, but I ordered a new one in case it has stretched and might be limiting the fuel delivery by not opening enough (starving the system ?) I've purchased a new coil in the event that a winding was opening to ground after warming... Had an old Austin American that would do that always when crossing a bridge or in a tunnel LOL Again thanks, I'll let you know my results I'm out of town at the moment and have not received the diaphram yet.



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Sounds like the engine is running out of fuel. There could be two reasons for this. One, the vent in the gas cap could be stopped up. Try loosening the cap, but don't take it completely off unless you want a lap full of gasoline, and take gentle ride. Do this with a half tank or less of fuel for the same reason I just mentioned. See if it still does it. Secondly, in 1996, Harley started putting vacuum operated petcocks on the bikes. These do give problems. They have a diaphragm that is opened by engine vacuum allowing the fuel to flow to the carb. If the diaphragm gets a hole in it, it will not allow fuel to the carb. To repair this, you must take the petcock out of the tank. Disconnect the fuel and vacuum hoses. Loosen the large nut until fuel starts to flow out. Catch the fuel with a large funnel and an empty gas can. Remove the petcock and take the four small bolts out that hold the square plate on the rear of the petcock. Carefully remove the plate observing how the needle, spring, and diaphragm are in there. Hold the diaphragm up to the light and gently stretch it looking for holes. If you find a hole, replace the diaphragm. While you have the petcock out, clean the fuel screen.

Good Luck

Posted on May 29, 2011

  • 1 more comment 
  • wd4ity
    wd4ity May 30, 2011

    If you can find a hand operated vacuum pump, connect it to the vacuum port of the petcock and apply a little vacuum to it. Watch to see if it "holds" the vacuum. If it does, the diaphragm and everything there is good. While you've got the vacuum pump. Apply the vacuum and check for free flow through the petcock. Apply vacuum and watch the fuel flow out of the petcock. To test the primary windings in the coil, use an ohm meter across the primary terminals with no wires attached to them. You should read between 2-3 ohms.

    Good Luck

  • Barry  Meldrum
    Barry Meldrum May 31, 2011

    Thanks, I'm waiting for a new diaphram. I didn't have my vacumn pump handy but I believed that was the problem originally. Not the coil, I'm now stocking a new one. lol

  • wd4ity
    wd4ity May 31, 2011

    I think everyone has a new coil lying around for the same reason. LOL I know I've got one but mine is one of the high dollar Crane units. Oh well, I'll run across somebody that needs one someday. Ride Safe. Steve



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