Installing the FMF powerbomb and q4 this weekend,going to start my jetting at 125 main and 40 pilot,what is the purpose of drilling the slide and what gains? I already picked up the kdx snorkle but will try it on and without.

 

if its a 09 do a 132 main 40 pilot remove snorkle a/f screw 1.5 turns out works perfect i never drilled the slide

 

mines an 06 and alot of guys here seem to run the 125 so I figured its a starting point.

 

thats fine but you have it off just go with the 128 or the 132 you will be happy

 

I'll try it,just still wondering about the slide and what gains it gives

 

to me its not enough for me to do it its not going to get you a whole lot of horsepower

 

Drilling the slide or shortening the slide spring to lessen the tension, provides quicker throttle response. For my 07, I went with the recommendations in the Dynajet kit for the 09 klx 250 and went with the 1" shorter spring, 128 main, stock pilot and the a/f screw set at 3 turns. I have the snorkel removed and an HMF slip on with the quiet core and the bike runs great.