Fuel Starvation? - Ex-500.com - The home of the Kawasaki EX500 / Ninja 500R
 
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post #1 of 7 (permalink) Old 7-10-2015, 10:50 AM Thread Starter
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Fuel Starvation?

Hello everyone, yesterday i picked up my ninja 500r from the shop to have to carbs reconditioned. I bought the bike after it had been sitting, and had gone through everything but the carbs, and wanted a professional to do them because i'm not the best at them.

So they cleaned them and put in new float valves. I had cleaned out the tank and put new gas in it, but when they had it they said the gas in the tank was no good, but they got it to run by pouring gas straight into the fuel line. (i think this is the tell tale sign of the issue)

So i get it home and take the tank off and drain it and put new gas in it, hooked everything back up, let it sit for a few minutes. It starts and runs and i can rev it up for a little bit, but then it won't let you do anything more than idle. If you give it throttle it shuts off. It will idle just fine.

So it seems to me there is an issue with the gas getting to the carbs. Tank gas good gas (bought today), It has a little over a gallon so i'm keeping it on reserve for good measure, new fuel line with no kinks. I know this is a vacuum system, so gas only comes out when it's needed. vacuum hose from carb is hooked up to petcock.

Could this be an issue with the petcock? that's the only thing left that i haven't repaired/replaced. Or is it some other vacuum related issue to the carbs?

Any and all help is appreciated!!
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post #2 of 7 (permalink) Old 7-10-2015, 11:09 AM
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Re: Fuel Starvation?

Keep letting it run for a bit, as it takes some time for the good fuel to make way! When I bought my bike bad fuel was a big problem. After a few minutes running with good fuel it eventually let the RPMs climb.

Chicago, IL - Cincinnati, OH
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post #3 of 7 (permalink) Old 7-10-2015, 11:19 AM Thread Starter
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Re: Fuel Starvation?

Feels like i've been doing that all morning!!! i just wanna ride!, considering i took off work today to get it inspected. Thanks for the advice though
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post #4 of 7 (permalink) Old 7-10-2015, 11:43 AM Thread Starter
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Re: Fuel Starvation?

I just let it run for a few minutes at idle, and it will idle for awhile and then shut off. won't start back up unless you let it sit for awhile and let the carbs fill back up.
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post #5 of 7 (permalink) Old 7-10-2015, 11:52 AM
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Re: Fuel Starvation?

Quote:
Originally Posted by 09inBlue
I just let it run for a few minutes at idle, and it will idle for awhile and then shut off. won't start back up unless you let it sit for awhile and let the carbs fill back up.
They shouldnt fill up unless the bike runs... hence the vacuum. I'm wondering if the carbs were incorrectly rebuilt or that the petcock is being difficult.

Chicago, IL - Cincinnati, OH
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post #6 of 7 (permalink) Old 7-10-2015, 12:20 PM Thread Starter
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Re: Fuel Starvation?

Thankyou Urbane, i haven't called the shop yet. When i picked it up they said to bring it back if i had any issues, i just wanted to make sure i wasn't missing anything simple. It's either the petcock or carbs. I can either try to rebuild the petcock or get an OEM one for $88. Not sure what i wanna do.
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post #7 of 7 (permalink) Old 7-10-2015, 6:19 PM
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Re: Fuel Starvation?

09inblue-

see the little drain nipples at the bottom of each carb?
attach a hose routed into a catch can.......loosen the drain screw (right near the drain nipple)
the carb bowl holds around 2-3 ounces of fuel......and should spew that amount out, each side provided petcock is, in fact, allowing flow (allowing bowls to fill)

You can go on now to examine the drained fuel for water or contaminants.

Now that the bowls are empty, it'll take a couple of start "cycles" for them to fill again. Of course you retightened the drain screws.

Alternately....you can run clear tube up the side of the carb to determine whether there is sufficient fuel in the bowls and thereby whether the petcock is allowing flow.

Alternately....you can pull or raise the tank...removing both hoses from the 'cock.
Using a length of 5/16 ID hose into a catch can...and a vacuum hose to the 'cock vacuum....you can apply vacuum and the petcock should flow fuel.

Alternately....you can remove the petcock and test on the bench, this way allowing you to examine petcock inlet screens too.

Above offer various ways to confirm fuel is actually flowing and reaching the bowls.

Furthermore.... you should have sent me your carbs for refurb, tisk tisk.

this additional info may help...I had occasion to drain full bowls today....total of 100cc for both bowls (used a common drain) so approx 50cc per bowl. I'll measure this with more precision on the next carb set I test.




“Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba....” quote Hunter S Thompson

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