Need carb setting recommendations - Kawasaki Ninja 250R Forum
 
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post #1 of 7 (permalink) Old 04-19-2013, 07:25 AM Thread Starter
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Need carb setting recommendations

02 250. Stock except for k&n pod filter.

Right now, needles shimmed with 2 washers, 108 mains, and 38 pilots. Screws turned out three full turns.

Bike has trouble running with no choke. Idle hangs. Ideas for what I can check/ change?


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post #2 of 7 (permalink) Old 04-20-2013, 06:31 AM
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Have to turn screw out more. Turn it out till rpm comes down smooth.
Your idle is running to lean.
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post #3 of 7 (permalink) Old 04-20-2013, 04:09 PM Thread Starter
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That's kind of what I was thinking. How much can I turn them out before i have to go up in pilot jet size? I'm out 3 full turns right now


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post #4 of 7 (permalink) Old 04-23-2013, 06:03 AM Thread Starter
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Also isn't a hanging idle indicative of a vacuum leak?


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post #5 of 7 (permalink) Old 04-23-2013, 07:06 AM
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Bike has trouble running with no choke. Idle hangs. Ideas for what I can check/ change?


If it has problems running with out the choke. The pilot jets are clogged and need cleaning. This is the case 95% of the time.


How much can I turn them out before i have to go up in pilot jet size? I'm out 3 full turns right now


If you have to go more than 2.5 turns it's usually an indication for a bigger pilot jet. But for high altitudes a smaller one is needed. In most cases the stock pilot jet will work fine. Also a proper adjustment in idle speed may be necessary.


Also isn't a hanging idle indicative of a vacuum leak?

Yes. Also it could be a lean condition, idle mixture issue or a need for a valve adjustment. You may want to make some adjustments based on your altitude, the temp and humidity. A main jet change may even be necessary since you removed the airbox. since 105s are stock, a 108 main jet could be too small depending on how the bike runs overall.


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post #6 of 7 (permalink) Old 04-27-2013, 06:21 PM Thread Starter
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Also, I was planning on doing a valve job, should I wait until after I get the carbs sorted? Bike is sitting now with everything off but the valve cover.


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post #7 of 7 (permalink) Old 04-27-2013, 06:24 PM Thread Starter
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As far as everything else.

The pilot jets are brand new, so hopefully they shouldnt need to be cleaned already.

Altitude is maybe 60ft above sea level. temp and humidity is moderate (bay area, CA)

What will happen is the idle will hang and then when it finally comes down it will bog down to about 800 to 1000 rpm. needless to say, I'm stumped. I have 110 and 112 main jets sitting on the work bench, would going up in main jet size help?


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