Author Topic: Ninja 250 carb help  (Read 2239 times)

Offline LukeNukeEm

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Ninja 250 carb help
« on: March 10, 2012, 10:35:02 am »
So my carbs had a flat spot right at 6k, took it somewhere and they fixed it, but now it wont run above 8.5k.  Its like its redlining.  THe redline isnt till 12k on these little bikes.  Any suggestions?  I dont know if Im running too lean or too rich.  I am thinking they put too high of a needle in the carbs and its getting too much gas.....

Offline Curtie223

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Re: Ninja 250 carb help
« Reply #1 on: March 10, 2012, 10:39:56 am »
Your on the right track. What does it do when at 8.5 you just let off the throttle. I.E. pop crack backfire?
My guess is that they just adjusted the needle. Thus making it not open all the way. which could be making it lean up top?

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Offline kpsr

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Re: Ninja 250 carb help
« Reply #2 on: March 10, 2012, 11:27:17 am »
Could be any number of things. Low float level, incorrectly adjusted needle, clogged air jet, top hats not installed correctly (restriction of proper movement of slide), and the list goes on............... 

Offline 2wheeltech

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Re: Ninja 250 carb help
« Reply #3 on: March 10, 2012, 11:36:45 am »
In addition to what Willis said, Improperly sealed air  box or air box not on the carbs properly.

Offline LukeNukeEm

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Re: Ninja 250 carb help
« Reply #4 on: March 10, 2012, 12:09:04 pm »
Wow thanks guys for all the help, I went out and got it warmed up, and ran it up the road.  It did not back fire or pop or anything when I got it up to 8-8.5k and let off. I ordered an aftermarket K&N air filter today.  I wanna think they put bigger jets in it than they should have.

Offline IanC

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Re: Re: Ninja 250 carb help
« Reply #5 on: March 10, 2012, 12:42:47 pm »
K&N drop in or pods? Opening yourself to all kinds if tuning troubles with pods.

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Offline Curtie223

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Re: Re: Ninja 250 carb help
« Reply #6 on: March 19, 2012, 06:24:03 am »
+1 on what Ian said.

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 2004 LTZ400



-When you see another rider keep in mind that is another friend you haven't had the chance to meet yet!!
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Offline LukeNukeEm

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Re: Ninja 250 carb help
« Reply #7 on: March 19, 2012, 12:27:38 pm »
It's  a single pod.  I think its helped it a lot. Just needs some fine tuning

Offline IanC

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Re: Ninja 250 carb help
« Reply #8 on: March 19, 2012, 07:21:48 pm »
The only bike I have pods on is one of my 450's and that's only because you have to take the engine out of the frame to remove the airbox. I wasn't gonna to fight that when I wanted to work on things so I put pods on. I hate them but I hate pulling engines more.
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Offline LukeNukeEm

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Re: Ninja 250 carb help
« Reply #9 on: March 19, 2012, 08:11:45 pm »
The ninja 250 is about as bad, have to drop the rear fender, then move the airbox back enough to get the carbs out.  Hadto take the whole rear wheel off to get the airbox out.  Its reving much stronger, just need to fine tune it and its gonna be great  :21

Offline GreenEnvie

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Re: Ninja 250 carb help
« Reply #10 on: April 15, 2012, 09:27:58 pm »
Mine has the pods and stock exhaust. Not sure if the previous owner installed the jet kit, but it is smooth all the way to redline and now pops when I let off.
-Burnsey
04' Ninja EX250

Offline LukeNukeEm

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Re: Ninja 250 carb help
« Reply #11 on: April 30, 2012, 07:04:19 am »
Took the carbs back out to check the needles, and all the recommended dynojet needles are in there, and out 2.5 turns.  It seems like it is still getting too much air.  Its fine when its revving, but when I let off and the try to get back on it, it seems to choke until I give it more gas and finally gets going.  So it seems I need to mess screw. 

Question is, do I turn it in for more gas, or out?

Offline gl1dinorider

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Re: Ninja 250 carb help
« Reply #12 on: April 30, 2012, 07:25:50 am »
should be turn out for more fuel. conical needle tip in a conical port. more its out the larger the opening.
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