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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  • Master
  • 4,565 Answers

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
Steve

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
    Steve

  • 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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I have a 2003 Harley Davidson 1200 sportster,


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I have a 2005 harley davidson sportster xl 1200 custom. after bike is at normal operating temp.when i stop for redlight or stop sign, bike idles to fast.i can let out on clutch little bit and it will slow...


If the carb is adjusted correctly, the engine will not idle without the choke when cold. I will usually take at least 3 to 5 miles of riding to get the engine warm enough to idle by itself without the choke. If your bike is a full operating temperature, it should idle at about 1000 RPM. If it's idling higher than this, you need to slow it down a bit.

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I just bought a 2000 harley davidson sportster it has been sitting for 5 years it fires right up but will not rev up it will die. How do i fix this?


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1 Answer

2005 1200 sportster bogs when idling


It could be any number of things but I would tend to think that it's something to do with the carburetor. It could be something as simple as it's idled too low. The idle speed should be about a thousand RPMs or so.

Your bike also came from the factory jetted extremely lean. A "jet kit' may help the problem in that it will richen the mixture up just a bit making the transition from the idle circuit to the midrange circuit smoother.

Next, you may have a problem with the accelerator pump on your carb. If the pump is not working correctly. Remove the air filter cover and element so that you can see into the carb. With the engine NOT running, crank the throttle to wide open position while looking into the carb. You should see a stream of fuel being squirted into the carb out of a brass nozzle in the throat of the carb. If you don't see this, you need to have the carb serviced.

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1 Answer

My bike seems to be missing on one cylinder. I have installed spark plugs but no change.


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Now, you could still have a bad coil. The only way to check this is to verify that both plugs are indeed firing. If the rear cylinder is missing, swap the plug wires at the coil. If the front starts missing, the coil is probably the culprit.

Otherwise, I would suspect a vacuum leak in the intake manifold. There is a vacuum hose on the back side of the carb that goes to the VOES and the petcock. Check this hose for leaks and cracks.

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