Hey guys, I am a long time lurker in this forum but I finally registered to ask a few questions.

I have a 2009 KLX250S and I am starting to mod it. All I have done so far is put a tail rack and a skid plate on it. For my next mod I want to purchase the two brothers slip on exhaust and uni air filters but I have read here the carbs need to be jetted when doing this.

This is my first motorcycle so I am not very mechanically inclined when it comes to the engine. What jet kit would work with that exhaust and air filter? And does it need to be jetted a specific way to get the best performance out of it?

 

Yep, you gotta pull off the carb and rejet it. What is appropriate will depend on the extent that you plan on modifying the performance - for instance, are you going with only a slipon, or are you going to eventually get a performance header as well?

So, what are your plans for the future?
What is/are your riding elevations?

I can assume the MCM is not going to be in your bikes' future..?

Answer these questions and I can give you the correct "recipe" for re-doing your carb.