Question about 1979 Harley Davidson XLH 1000 Sportster

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Rebuilt carb now pump not working, may have diaphragm backwards?

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  • wd4ity
    wd4ity Jul 10, 2010

    What kind of carburetor are you working with. Keihen, S&S, Bendix?



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With the float bowl off the carb and turned upside down, the diaphragm goes in with the ridge downward in the groove in the float bowl. Then the return spring goes on top of the diaphragm. make sure the small o-ring is it's postion and then put the accelerator pump cover on with the two screws. Turn the bowl right side up, and pour it about half full of fuel. Using a small hex key or allen wrench in the place of the fuel pump's accuator rod, depress the diaphragm a few times and verify that the pump is working. When putting the float bowl back on the carb, don't forget to align the actuator plunger up with the hole that it goes into on the float bowl.

Good Luck

Posted on Jul 31, 2010


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Did you install a new accelerator pump diaphragm, and adjust the linkage throw? Is this a cold engine problem? Choke working?

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when the carb was "rebuilt" Did you pull out the screen and clean it out and also did you pull needle and diaphragm out and clean it out good, because if the needle is not working or the neoprene tip is swollen your needle adjustment will be out of whack,sometimes carb cleaner will make it swell up to where it won't open enough to get fuel through it....suggest you replace the needle and adjust your height of the tab to flush with the body of carb and make sure you have a good diaphragm in it along with new check-valve diaphragm, then make sure your primer is hooked up right should be pulling fuel through the filter to carb and through carb and back to tank,your problem is definitely in the fuel system, keep trying different things you will figure it out

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1 Answer

My 2000 roadking classic at an idle runs great but wen i give it throttle it bogs right down like its gonna die but doesnt

If the engine is equipped with a carburetor, it sounds like the accelerator pump is not working. Take your air filter off and with the engine OFF, crank the throttle wide open. You should see a squirt of fuel squirt into the carb from the brass thing in the mouth of the carb. If not, the accelerator pump is not working. It probably needs a new diaphragm in it.

To put a new diaphragm in the carb, remove the air filter backing plate and take the four screws out that holds the float bowl on. With the float bowl off the carb, turn it upside down. Take out the remaining two screws in the accelerator pump plate. You'll see the diaphragm and the return spring under the plate. Put the new diaphragm on position with the sping on top and reinstall the plate. Put the float bowl back on the carb and reinstall the air cleaner backing plate. Make sure the throttle works as it should and start the engine. It should rev cleanly now.

Good Luck

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1 Answer

Spits and coughs and leaks gas threw carb

Usually spitting and coughing back out of the carb is due to a lean fuel air mixture. I'd go up one size on the slow speed jet in the carb. Maybe raise the needle by putting a 0.020" (standard 3mm flat washer) under the needle in the slide. Remove the needle from the slide, put the washer on from the long end of the needle, and replace it.

The leak is another matter. Usually when the stock CV carb leaks, it's because the accellerator pump diaphragm has a hole in it. This allows gasoline to get on the top side of the diaphragm and then it comes up through the top of the hole that the pump push rod goes down through.

All in all, it sounds like it is time to have your carb rebuilt. A thorough cleaning INSIDE and out and a few parts replaced. That should cure your problems.

Good Luck

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1 Answer

Having trouble getting bike to run whenI give it

This is more than likely a carburetor problem. Either your main jet is stopped up or your accellerator pump is not working.

Take the front cover and element out of your air filter so you can see down into the carb. With the engine off, twist the throttle. Watch to see if a stream of fuel squirts into the carb, If you don't see it, your accelerator pump needs to be rebuilt. If you do see the stream of gas, then it sounds like your main jet may be stopped up.

One other cause is that your diaphragm for the slide has a hole in it and not operating. Start the bike with the air filter element out. Rev the bike and watch to see if the slide lifts up. If not, bad diaphragm.

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Thanks Jerry.
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Either the carb is still not shutting the fuel off, or the fuel pump diaphragm is perforated allowing fuel to enter the rocker housing and into the sump.

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I've never seen a KT100 before, but i've worked with similar engines.
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The first place you should look is if there is a short pipe from the crankcase to the carb so that the pressure pulses from the case can move the diaphragms. You should be able to see this from some pics on google images. If thats all ok, you should check if the carb is perfectly clean. If its still giving you problems, change the diaphragms in the carb. You should be able to get a replacement rebuild kit from a dealer.

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