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Old 07-19-2008, 08:44 PM   #1
coojo
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gas tank whistling?

still haven't figured out what is wrong with my bike, I am giving up trying to do any more self checking because I'm afraid I will attempt to work on more than I understand and just cause damage to it. Seems to be flooding every time I give it any gas, and now when the bike is turned off I hear a whistling from the gas tank. I open it up and can feel the air escaping. Could this mean that part of my problems are a hose that was pinched when I laid it down?
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Old 07-19-2008, 08:47 PM   #2
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It's a normal Kawasaki thing. It's just the pressure from the gas tank coming out.
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Old 07-19-2008, 08:53 PM   #3
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, hoped there would be a quick fix for it that would solve all my problems, off sunny's i guess
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Old 07-19-2008, 08:54 PM   #4
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does it whistle dixie?
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Old 07-19-2008, 08:54 PM   #5
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For what? That air escaping is totally normal. There would be a problem if it WASN'T coming out.
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Old 07-19-2008, 09:01 PM   #6
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no, my bike has other problems that I'll get a pro to look at
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Old 07-19-2008, 09:02 PM   #7
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AH ok, I thought that was your only 'problem'
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Old 07-19-2008, 09:18 PM   #8
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Are you sure your bike is flooding (too much fuel) or could it be stalling from too little fuel?
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Old 07-19-2008, 09:34 PM   #9
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i do not know... i have been keeping the choke at full (5k rpms) while i play with it (only for a few minutes at a time). giving it any gas will cause the rpms to drop, if i just keep giving it gas, it dies. however, i can give it a little, let off it and keep giving it little spurts and it sort of works it's way through the problem, but once i stop giving it gas, or even let up on how much i'm giving it, it will get the same problem when i try to give it more. I'm not going to risk riding the bike like this. also when i've tried adjusting the idle speed (choke off and after it's warmed up), it doesn't seem to make any difference no matter how much i turn it in either direction. I don't think the problems are related, but any advice on either would be nice. Either way, it's going to the shop soon.
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Old 07-19-2008, 10:56 PM   #10
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I think I know whats happening.
There is a vent in your gas cap. If it gets plugged then your bike will run OK for a couple minutes (depends on how much gas is in the tank).
As the fuel level drops, it starts to pull a vacuum on the tank and the engine starves for fuel.
That's why when you open the cap you feel air whoosh. It's flowing INTO the tank, because of the low pressure.
So, find and clean the vent and it should help.
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Old 07-19-2008, 11:05 PM   #11
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If the vent is in the gas cap an easy way to test and see if that is the issue would be to crack the gas cap and start the bike, no?
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Old 07-19-2008, 11:30 PM   #12
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My bike do the same. It's normal
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Old 07-19-2008, 11:43 PM   #13
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sounds like running it with the tank open will be the tell all. If it runs fun its a vent issue.
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Old 07-20-2008, 03:36 AM   #14
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2004... carbed or FI? if ur problem comes the moment you roll the throttle, whether in gear or not, its a load request issue.

If FI, could be a sensor problem. You could also have an unmetered air leak(or uncompensated air leak) that comes into the equation when you open the throttle.
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Old 07-20-2008, 04:11 AM   #15
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Originally Posted by Caligonetx View Post
2004... carbed or FI? if ur problem comes the moment you roll the throttle, whether in gear or not, its a load request issue.

If FI, could be a sensor problem. You could also have an unmetered air leak(or uncompensated air leak) that comes into the equation when you open the throttle.
carbed, and i bet the choke is stucked half open maybe its hanging up somewhere
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Old 07-20-2008, 07:12 AM   #16
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Sounds like your carbs need to be disassembled and cleaned.
How long has the bike sat up without running properly?
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Old 07-20-2008, 08:55 AM   #17
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Maybe we need a 250 Ninja maintenance forum.
Seems like a lot of people have questions about the trouble they are having wit 'em.
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Old 07-20-2008, 09:05 AM   #18
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Yeah, sounds like yours is on the way to doing what ours was doing... I just disassembled and cleaned the carbs yesterday and the thing runs like a champ now. Started up this morning without any choke at all and didn't "hesitate" or die when I gave it throttle.

The pressure/whistling is normal. http://faq.ninja250.org/wiki/Why_doe...when_I_stop%3F
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Last edited by Blue91; 07-20-2008 at 09:07 AM.
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Old 07-20-2008, 09:25 AM   #19
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Hey Blue the gas sucks. My boat had 58 hours on it and the gas got it. I had to take it in to get the carbs cleaned. It sat for 30 days or so. Thats all it takes. I almost had it with Barryman chem tool, but they were too far gone
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Old 07-20-2008, 09:25 AM   #20
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just get a gsxr that will fix the prob
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