i have a 09 250s i just put on the big gun plus the header i changed the jet from 118 120 is that right?

 

I think most guys are installing the 128 main jet, the KLX300R N1TC needle (clip 2nd position from the top), KDX200 Snorkle, a 35 or 40 Pilot Jet (with a Kouba FS2 adjustable fuel screw), a high-flow air filter and full exhaust system of your choice. I purchased the Big Gun EVO-R. You must take into account your elevation that you ride at and relative humidity. You should do a search on this topic followed by LOTS of reading. Good luck. . . these mods made a huge difference on my '06 KLX250!

 

Big gun says all you need to do is go one up on the main if all your adding is the exhaust. I have the same exhaust. I love the way it sounds on my 07.

I added a "pumper carb"

You could spend the 50.00 and get the dynojet kit ad the k&N filter as well.

 

Hey towingjames, welcome to the forums. Now go to the "New Members" page and give us a proper introduction. That's an order! Oh and what's the user name all about? Do you own a tow truck? Is your name James? And finally how do I get the voices in my head to stop?

 

Yeah. . . how DO I get the voices in MY head to stop. . . oh wait. . . that's just me talking out loud to myself. . . MUST be getting old!

 

How do I get the voices OUTSIDE my head to stop?

(5 kids, a wife, and 2 dogs...I can't even spell "silence")

 

mc1457,
Must be so nice to be surrounded by loved ones!

 

He didn't say they are his.

 

how does it run? Does it sputter at full throttle when the bike is under a load? For instance going up a hill? What elevation do you live at? 120 seems a little lean but maybe not.
Here is a link to a blurb on jetting. Scroll down a half page to Jetting guidelines.

http://www.powroll.com/tech_specs_jetting.htm

 

i am running a 127.5 main and 37.5 pilot.