Quote:
Originally Posted by higear223
The dynojet needles are thicker and less tapered.
I have the idle set at 1500. As the rpms hit 2000 it bogs and clears at 2500which is about 1/4 throttle. If you open the throttle quickly it bogs and won't recover. Open is slowly and it clears and takes of like a rocket at 3000.
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That would mean they (Dynojet needles) give overall leaner metering (if they are the same length as stock), and because they were better than the original ones, would mean you are still getting too much fuel at mid-throttle.
As others noted, it may be an issue with one of the carb diaphragms, or air passages that operate the diaphragms. You may need to remove them and inspect them closely.
Take the air filters off and lift the slides manually (engine off) to see if they rise and fall smoothly. If that's ok, start it up and watch them as you open the throttle to see if they move together.
Look over this section -
http://faq.ninja250.org/wiki/Intake and confirm that everything is correct. There have been instances where the carb was not assembled correctly but it still ran. Any chance the "collar" (
http://faq.ninja250.org/images/e/eb/Jim_carb_2.jpg) was not inserted properly from the bottom before screwing in the "holder"?