Clay, I have no idea what the very best fueling for the stock muffler+lidless would be. I can only guess. So my guess for 4k ASL: DJ124 main jet, clip on top notch(1N), and do NOT drill the slide lift hole.

 

Clay,
When wintertime comes around and you can't ride, think about checking valve clearance. With your observation of possible high mileage, a valve check is a good idea. Going through all the bearing (swing arm, linkage, wheels, steering stem) is also a good idea.

If your bike is hard to start when cold, consider drilling the enricher/choke jet to 0.018". This has been a good solution for many of us with hard starters. I replaced the soft carb bowl and cap phillips-head screws with allen head. If you ride deep water, do the "T" mod to the two carb vent hoses.

 

Yes I'll definitely be drilling out the choke circuit. Bike wouldn't start last week after being out overnight and it didn't even get below freezing.

Klxster why do you say not to drill the slide hole? I thought that was normal with the 2206 kit since it didn't come with a different spring.

 

I pulled out my DJ2206 kit for you.. You do know that it is designed to run in a KLX300R, not a KLX250s - so you are going "off the reservation" by using it.. The directions, for your stock exhaust, will have you drill your slide, put the clip on 4N, and install the DJ124 main jet. If you do that, I would certainly not go 4N. From what we are learning about the 2206+KLX250, I'd go 1N or 2N.


If you ever get a performance slipon, your best main jet will calculate out to a DJ134. I/we are still learning about use of the 2206 with Dyno testing, but from what we have at this point, in the case of a performance slipon, you'd need to run a DJ134, 1N, with a stock lift hole likely being better than a drilled one..

If you install as per instructions and it overfuels your low-mid range, you'll never know it. It'll be more powerful and you'll love it. You'll never know what your missing. Best to start out conservative with no drilling and 1N - ride it a while - then try 2N - repeat this with 3N and 4N.. If your really "in tune" with the bike and set up repeatable tests for low-mid throttle response and power levels, you'll know where she runs best at..