It can also be added that before you go shimming needles, get those pilot screws adjusted PROPERLY as they are set very lean from factory.
The
Ninja 250 FAQ covers this, and the process is simple and can sorta be done on the bike.
***NOTE: All model years of the 250 and 500 can benefit from this.***
1. Drill out the pilot plugs located at the bottom of the carbs.
2. Factory setting is around 1.5 turns out. Not enough.
3. Screw both pilot screws/fuel mixture screws in
4. Back both out 2-2.5 turns.
BOTH carbs must be exact. Paint a small dot on the screw driver if necessary so that they are consistent.
If you're still having problems, shimming the needles is the way to go, but start with what is cheapest, easiest and makes sense first.
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