TE/TC AOMC Mikuni Jet kit for 17 TE/TC/TX model 250/300

Another option to take away some of the guess work. (remember to check the float level before chasing your tails, JD Jetting has acknowledged this issue as well)

http://www.ktm-parts.com/AMP2600.html

Is that the S-1 needle jet?

ask aomc I have no idea. I just want a new brass collection for the new machine mikuni, I have oem kit, jd jetting and now aomc , so far oem is fine and seems to match the book chart very well once I lowered the daggone float height that would spill fuel at even the slightest side lean angle.

Well, there has been a lot of discussion about replacing the needle jet. The stock one is the R-8 and I believe the next rich one is the S-1. That has been the discussion that the lean needle jet has ben causing one to have to have a big pilot jet. Changing the needle jet is a bit more tricky.
It goes:
R-8 = 2.79mm
S-1 = 2.805mm
S-4 = 2.820mm
Diameter of the hole.

I just installed a JD kit and it vastly improved the jetting. Not 100% perfect (yet), but way better. No more bottom end bog. I can't believe they went down to a 30 pilot from a stock 37.5. That is a huge jump

I had a full season on the TX and made some subtle changes along the way. Final jetting as follows with significant improvements when I "opened" up air box that included holes on top of air side and open hole on right side:

Needle: 6bfy44-74 top clip
430 main(stock)
35 idle(went from 37.5 stock) definitely improved bottom
80 starter jet(stock)

Kingston ontario 0-3000 ft riding ranged across Ontario but pretty flat..

Now why did I order the JD kit....good question....will certainly update when I install and compare but I now have my GOTO summer settings with the above in case the JD won't make gains. BTW plug was a nice marshmellow brown but still a taaad on the rich side.