[xridgerider]

I found this site last summer and it has been nothing but help! I have a 05 250x and it is a WAY better bike now. I just did the JD kit and now I am all smiles. What a wake up for the x!! My question is I am thinking about changing up the new FMF Ti Q4 pipe and I am curious what changes in my carb will be needed if any. Any body have opinions on these pipes? Awesome site! Thanks...

[Halen]

If the air box is already opened up you would be able to increase the main jet. With the JD system installed, I was running a 42-158 with a stock pipe. After purchasing a FMF Powercore Ti and a Hotcam stage 1, I contacted JD and they suggested a 165. I also increased my pilot jet to a 45 with excellent results.
Hope it helps.
Van.