[86-07] Throttle response issues. Dies when throttled. - Kawasaki Ninja 250R Forum
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post #1 of 4 (permalink) Old 06-28-2015, 09:26 PM Thread Starter
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Location: Roseburg, OR, USA
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Throttle response issues. Dies when throttled.

So my newly purchased '07 Kawasaki Ninja EX250 is giving me some throttle response issues.
It seems to idle just fine (though it idles a bit low) but when I give it throttle, it'll occasionally drop rpms and either shuts off or goes close. Thinking it is build up in the fuel lines/carb/etc., I threw some SeaFoam in there to clean things up. When I'm riding it it doesn't seem to be an issue. It has once or twice died on me when coming to a full stop but this isn't a common occurrence.
A video of it (it was slightly warmed up prior and thus wasn't as bad): https://www.youtube.com/watch?v=bYvQ4_54M_o (I apologize in advance if it's poorly recorded)
Well, nearly burned through the tank with the sea-foam in it and the problem persists (maybe slightly improved but not sure). Any suggestions/references?
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post #2 of 4 (permalink) Old 06-29-2015, 01:16 PM
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You're right, it definitely sounds like a carb issue. Could be something as simple as syncing the carbs, or they may need to be cleaned.

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post #3 of 4 (permalink) Old 06-30-2015, 05:27 PM
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Yup try to adjust the a/f mixture in the carb also replace the spark plug and see what happens.
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post #4 of 4 (permalink) Old 07-23-2015, 04:40 AM
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Have you adjusted the idle mixture screws? Or done any other maintenance? Any modifications to the bike?

If you've removed the tamper caps from the idle mixture screws, then you need to dial them in,

Your initial setting should be 3 full turns out from the bottom, remember just slightly tighten them, don't go all Conan on them.


Then warm it up, slowly turn 1 side pilot screw in until the rpms drop, then back out till RPM's peak (and no further)* Twist throttle...see how it reacts...tweak to taste.
Repeat on other side... test ride. You're looking for best throttle response and transition from just cracked to 1/4 throttle opening or so.*

Thats a quickie, 10 cent tutorial on setting pilot screws.**
Sounds like your carburetors need to be serviced, cleaned, etc.... Have you installed a fuel filter?

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Last edited by Ghostt; 07-23-2015 at 04:47 AM.
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