So im a n00b to carburators but i know my bike is running lean its a 06 ninja 250 the spark plugs show its running lean and so does the exhaust. I have an aftermarket intake and i think might be too free flowing so it lets air in too easy. I was wondering how do you enrich the fuel on a carburator? Ive never done it before isnt there a needle in there that lets the fuel in? Can i buy a bigger needle?

 

Bigger jets.

 

remove the filter since they make no difference on the 250 and put it back to stock, will save you from headaches in the future

 

I agree with Rednas, all that junk probably makes your 250 slower.

 

you either raise the needle or increase the size of the main jets... If your talking about A/F or idle, there should be a a/f screw on the carb body itself. This maybe behind a cap as EPA usualy did not want screwing with this for emmisions sake