Keihin Carb Tuning Pt 2 (2007 CRF250X) 

I'm just glad to hear that thing clacking like that cause my 450 sounds the same way.

42 pilot 1.5 turns , 165 main, 55 leak, red needle 5th position, adjust the D screw on the pump, air box mod and Big Gun.

45 pilot solved a lot of issues on my 06 250 fcr carb

have any more recent vids? im having the same problem 06 crf250r.

Pilot too big if running with the fuel screw all the way in

I’m running 42 185 5th clip pos 3 turns out Going to go with 45 pilot 185 main 5th POS And see if that makes it perfect

try a 45 or even 42 pilot jet your pilot jet is too big

its running way too rich not lean... close it all the way then set the idle then go down to a 42 and turn the fuel screw to 2 turns out and start again you will be much more successful