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Old 12-19-2011, 06:54 PM   #1
cuong-nutz
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Carbs: Fluctuating idle

I have a '10 Ninja 250. My idle fluctuates and its not smooth and consistent. I have the idle set at 1500 rpm. I took a video of my homemade manometer with the bike idling. Bike is warmed up already.

I did a valve job a couple of weeks ago and installed a Dynojet Stage 2 kit, removed the airbox snorkel, and set the clip on the 3rd position on the needles. Air filter is stock and kind of dirty.

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Old 12-19-2011, 11:25 PM   #2
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Oh and mixture screws set at 2.5 turns out.
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Old 12-20-2011, 03:26 PM   #3
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Float level is what it sounds like to me.
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Old 12-20-2011, 04:41 PM   #4
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Quote:
Originally Posted by kd5qoq View Post
Float level is what it sounds like to me.
Could you elaborate? I'm going to try seafoam and see if it changes.
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Old 12-21-2011, 07:13 AM   #5
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It sounds like the float level may be a little high if it's a Kehein carb.
I think that bike uses a CVK carb, is that correct?
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Old 12-21-2011, 09:25 AM   #6
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Also, did you sync the carbs after you did all that work? (looks like you did)
If not, that's where I'd start.
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Old 12-21-2011, 02:19 PM   #7
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Yep it's a CVK30. I didn't mess with trying to sync it as the idle fluctuated. I cannot see how syncing it would affect the idle.
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Old 12-21-2011, 02:21 PM   #8
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Synch, vacuum leak or too lean on the pilot circuit.
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Old 12-22-2011, 10:38 AM   #9
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+1 what Patrick said.
The hose nipples that you connect the mannometer to for synching, try connecting them together with a short piece of hose.
If it improves, you probably need to synch.
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