Carbs are not refilling - Ex-500.com - The home of the Kawasaki EX500 / Ninja 500R
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post #1 of 6 (permalink) Old 7-3-2016, 4:01 PM Thread Starter
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Carbs are not refilling

I have a 1990 EX500, and I have recently cleaned the carbs (new jets, gaskets, ect). After completing this it seems that I have a vacuum issue. I connected everything back together and manual put fuel in the carbs, sucking on the vacuum line connected to the gas tank. When I do this the bike is able to start, and then I instantly connect the vacuum line back up to the bike and it runs for a few minutes and dies like it is not getting enough fuel, which at this point I drained the carbs and only a little gas flowed out. Next I adjusted the carbs to run richer, and still the same thing happened. Any ideas??
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post #2 of 6 (permalink) Old 7-3-2016, 4:47 PM
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Check the vacuum line that goes from left carb to the gas petcock.

Check the gas level in the tank and the petcock in on or res position ,depending on how much gas in the tank

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post #3 of 6 (permalink) Old 7-3-2016, 8:25 PM
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^+1 If that looks good it sounds like petcock isn't getting vacuum. Check for leaks.
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post #4 of 6 (permalink) Old 7-12-2016, 12:31 AM
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Yeah, pretty much.
If the petcock is stock and you can suck hard and confirm fuel flow... then you need to check the vacuum line from petcock to left carb.
It doesn't take much vacuum to open the petcock. A slight leak in the vacuum line will cause issues.

Make sure the float valves are opening proper too.
Clear tube method.... blah blah.... same old same old...

O_E_M
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post #5 of 6 (permalink) Old 7-12-2016, 8:10 AM
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in addition, OP, in view of the age of this bike...consider an internal exam of the petcock as well...clear fuel passageways? Diaphragm movement inhibited? Evidence of internal corrosion? Are the pickup screens present? Are they clear?

26 years old (if still original? ).........it may be time to simply replace the damn thing
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post #6 of 6 (permalink) Old 8-7-2016, 9:09 PM
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Make sure your petcock is even opening I bought a petcock rebuild and for some reason the diaphragm was not opening not allowing the float bowls to fill I had good vaccume so I put the good stock one back in and it has been working great since


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