Hi all, this is my first post

I have been planning on upgrading exaust muffler, or removing baffles and opening it up a bit on the stock exaust.
I know I will have to adjust my carb (on my 2013 KLX250S).
But my question is can I get away with using the stock jets and adjusting the fuel/air mixture screw on the bottom of the carb and adjusting the needle inside the carb? Or will I need to purchase a Dynojet kit? My airbox is stock and I have not done any other preformance orientated mods.

Cheers, Sam.

 

You can do the dyno jet kit or you can go with Kiehin jets from Kawasaki. Here is a very helpful site that covers a lot of KLX stuff. D. Pippin's KLX250 page. The part numbers are listed. One tip I got was to put the slide, diaphragm down, in hot water to keep the diaphragm pliable. I don't know if it shrinks or expands as it dries, but we did it just to be sure. click here

My brother and I used jetting per the information there and it was pretty much plug and play. We are at around 1000 ft elevation. I will say I tried shimming the needle, but it didn't work as well as the Kiehin needle and I had to take the carb apart again to deal with it.

If you do dyno jet there is a member herer, klxster, who has given information in a number of threads here. Do a search to find jetting information.

 

Thanks you for that, sounds like i might order a jetting kit. Cheers

 

I thought my 09 KLX250S was the last year with a carb.

 

Pretty sure the first EFI 250s in the U.S. were in 2014, although I didn't look it up. I know they had the EFI version in other countries a few years earlier.

 

If memory serves (questionable these days), here in the US there was a carb'd 2014 or 2015 special edition right before they disappeared off the market for us. Then I think it was 2018 when they came back as EFI 250's, and I do remember reading that they were EFI in other markets several years before we got them.

OP, Definitely change the jets, either with a kit or with individual jets... makes a huge difference. I also recommend a quick-turn throttle tube. G2 makes one specifically for the KLX that I've been running for years and it is 100% improvement. With the stock tube, I had to change grip and 'get another handful' to reach full throttle. The quick-turn goes a long way in making up for the CVK lag... so much so that I've put off going to a pumper carb (although it is still on my radar).