Help Me Fix it... again - Sportbikes.net
Help Me Fix It A great place to post any problems you may be having while working on your motorcycle. Most of us are do-it-yourselfers so this is a great way to share any information pertaining to fixing something or adding something on.

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post #1 of 33 (permalink) Old 11-28-2009, 02:36 AM Thread Starter
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Help Me Fix it... again

So. I got my ninja (1997 600cc) running. Seems it was fuel locked (to much fuel in the cylinders I think) So I got that all cleared up. and it ran mint for a good 2 weeks. Rode every day rain or not.

Let it sit for 2 days. Went out.. Got it running. Went back inside. Put on my gear... about 5 minutes of idle. Then Came back out and started down the drive way...


I get to the road and I give it some throttle. It hesitates a little. About 100 more feet and its sputtering hard. So i turn around. And now It wont throttle up at all... So I had to idle and walk it back to the house...

Well I got it there. and it died... So I try to start it. And it does run.. But only with full choke. and it needs the starter to keep running (about 10 seconds at most) and then it dies...

Now it wont even fire. Its getting good clean fuel. And it does have spark (havent pulled plugs. (Missing my universal joint thing)


Did i foul my plugs some how? Or did something else happen? I cant figure it out... I cleaned the tank. and drained the carbs. I dont wanna pull these carbs off. Already rebuilding 10 other carbs.. Dont wanna add 4 more.

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post #2 of 33 (permalink) Old 11-28-2009, 07:52 AM
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Sounds like it is running out of fuel. This based on running only with full choke then not running at all. Check fuel delivery from tank to carbs. Possible vacuum line disconected from petcock
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post #3 of 33 (permalink) Old 11-28-2009, 08:20 AM
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STP Fuel Injection cleaner to clean out carbs- starter/pilot jets specifically. Cheap and as semi-safe as it gets if your too lazy to crack them open to clean them properly (I feel your pain here that how I know this^). You may also have water in gas; dump gas start fresh w/ STP FI cleaner (1/3 a bottle). Buy a cheap siphon at auto parts store/walmart; too hell with taking the whole thing apart just to dump gas. I stole moms turkey baster for this one year! She was pissed when she saw it but 'tis the season!

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post #4 of 33 (permalink) Old 11-28-2009, 12:50 PM Thread Starter
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Ha. Thanks guys. I have already replaced the fuel with a fresh tank. So its all clean. Already shook the tank with clean fuel. then drained. 2 times. Now its all good fuel.

Would STP be better? Or would SeaFoam work? And how would I do that? Just drain one bowl at a time? Since its not running? I got about 3 gallons in. so its about full.... but... I got a small fuel can with a fuel outlet line on it. So I can just elevate that high enough.. how do i get it to flow threw the carbs?

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post #5 of 33 (permalink) Old 11-28-2009, 03:11 PM
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Most bikes have a vacuum line to the petcock. Apply vacuum to the petcock and fuel should flow when in the on position.
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post #6 of 33 (permalink) Old 11-28-2009, 11:01 PM Thread Starter
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No vaccum line. It was the same as it has been for the 2 weeks I rode it.. I think I got water in the cylinders? Maybe Need to pull the plugs and let that stuff out?

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post #7 of 33 (permalink) Old 11-29-2009, 07:18 AM
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If you get water in the fuel system drain it through the carb bowl drain screw on the bottom of bowl
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post #8 of 33 (permalink) Old 11-30-2009, 08:26 AM
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after you drain the carb bowls you can use a small funnel and fill the carbs back up directly by the fuel line. this will bypass the vacuum operated fuel valve if you have one. then you can mix up a little gas and seafoam mix, fill the bowls back up.
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post #9 of 33 (permalink) Old 12-01-2009, 04:29 AM Thread Starter
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ok quick guys. I got the carbs taken off and they where gummed up. I cleaned out all the gel gas and made sure my jets were clear. and my float pins have 100% free motion without getting stuck. I didnt change anything when I took it apart. Put it back together just fine. It fired up after a little tinkering. Then all the sudden it floods out. cyl #1 and #2 seem to be getting flooded and putting it into fuel lock (not sure correct phrase.) To where it wont turn over from the pressure.

Well i took out the plugs 2 times. Each time i cleared the flood. And the bike ran. A little ritch. But it ran. Shot flames 1 or 2 times from the exhaust. (I ran it with the fuel petcock off. then turned it on.)

But after a few seconds (30) it will flood out. and not start back up. I have one of those califonia emmisons thing. And it shoots fuel to the line that leads back into the air box.


Well anywas. Fuel air mix prolly messed up ? How do I fix that? I really want to ride tonight. its been to long. Its 2:30 Am. I hope someone dont sleep like me and I can fix this tonight :-) Please please. Im itching to ride badddd.

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post #10 of 33 (permalink) Old 12-01-2009, 11:13 AM
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Either your floats are not working in shutting off the fuel flow or your vent hoses are blocked. The vent hoses are located aprox midway on the carb bodies.
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post #11 of 33 (permalink) Old 12-01-2009, 11:17 AM
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i don't think your mixture screws are the prob, it does sound like faulty floats, like veefer said.
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post #12 of 33 (permalink) Old 12-01-2009, 01:39 PM Thread Starter
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Ok. How do I go and adjust those?

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post #13 of 33 (permalink) Old 12-01-2009, 08:53 PM Thread Starter
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all my internal spring bumpers were stuck down... got those cleaned and fixed up :-)

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post #14 of 33 (permalink) Old 12-01-2009, 11:00 PM Thread Starter
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ok. now it starts up fine. But reving it up to 4 grand is were it stops. And it back fires... To ritch? need to take the floats back up or what?

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post #15 of 33 (permalink) Old 12-02-2009, 01:04 AM
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when your revving thats when the mixture is to rich and back fires in the exhaust? did you adjust the float height at all? how about the air mixture screws? i thought the float just kept the right amount of fuel in the bowls?
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