[2008+] Really rough engine and sucking gas - Kawasaki Ninja 250R Forum
 
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post #1 of 9 (permalink) Old 12-05-2013, 02:01 PM Thread Starter
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Really rough engine and sucking gas

Hi - this is my first post on this site. I bought a crashed 2012 250r. I've fixed it back up so it handles beautifully and looks good. But on my first longer test ride, the engine is incredibly rough, hesitates at all throttle levels except full out, will idle out at if I engage at anything lower than 5k rpms, backfires a lot and is sucking about 3 times as much gas as I think it should.

I've stripped and cleaned the carborator and played with the idle speed to no avail.

Any suggestions on next steps (other than taking it to a shop) would be appreciated. I'm trying to rebuild it on the cheap for a friend to buy it from me at cost.

Thanks in advance!

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post #2 of 9 (permalink) Old 12-06-2013, 09:08 AM
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How many miles on the engine?

Did you sync the carbs?

You adjusted the idle speed, but what about the idle mixture?

Have you checked the air filter?



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post #3 of 9 (permalink) Old 12-06-2013, 06:40 PM Thread Starter
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Changed the air filter. 4,500 miles.

I need to sync the carbs. Advice on how to adjust idle mix?

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post #4 of 9 (permalink) Old 12-06-2013, 06:41 PM Thread Starter
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And thanks for the response. Much appreciated.

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post #5 of 9 (permalink) Old 12-07-2013, 05:09 PM
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To adjust the idle mixture, you'll need to remove the carbs. It should probably be the last thing you try. The reason you would adjust the idle mixture is the same reason you clean the carbs: to correct the air/fuel ratio.

To adjust the idle mixture, you'll need to remove the carbs. There are two screws on the bottom side of the carbs that you'll need to turn in order to adjust them. I just did it on an '07 250, and I'm not sure if the procedure is the same or not.

Did you oil the air filter before placing it inside the airbox?



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Last edited by tadster00; 12-07-2013 at 05:12 PM.
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post #6 of 9 (permalink) Old 12-10-2013, 08:45 AM
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Quote:
Originally Posted by tadster00 View Post

Did you oil the air filter before placing it inside the airbox?
+1 this.


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post #7 of 9 (permalink) Old 05-01-2014, 10:02 AM Thread Starter
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It ends up the answer was that one of my vacuum seals was warped. Probably accidentally got cleaner on it. Cost $100 but now runs perfectly.

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post #8 of 9 (permalink) Old 05-05-2014, 11:06 AM
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Well that's good.

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post #9 of 9 (permalink) Old 10-07-2014, 09:02 AM
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+1 this.


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Is the airfilter oiled foam?....aint had mine out yet
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