Jetting the Mikuni TMX Carburetor

So here they are!

We love the JD needle in our 2018 KTM 250XC-W

If you want to order one from us, call 970-240-2197 or email at

If you want to ride, come to Montrose, Morgan will show you around.

[davidhull]

I was sure that I was going to switch to the kehin carb, on my 18 300 xcw. But I tried the jd kit ony mikuni first. I followed the instructions, used the red needle. Follow the jetting recommendations . Also installed the red power valve spring. Wow! Can barely hang on. It flat rips!!! Don't want any more. A beast. It is the fastest 300 I have ever rode. Don't miss my kx 500 any more.

[sxdeano]

I went from Stock (43-73 clip 3, pilot 25, main 440) to JDs (blue needle clip 3, 32.5 pilot, 450 main) what a difference, in Aus so out elevation never gets over 3000ft odd, bit higher else where yet all NAT parks so can't ride them anyway, no oil seeping out of muffler, ran super smooth especially helps on hill climbs and save 1.5L on fuel on the same 50km trail. on a 2018 TE250

[herdfreak]

I’m learning about jetting for my rebuilt 2001 Suzuki RM 125 stock engine with Pro Circuit full exhaust, using it mostly for hare scrambles here in the Charlotte, NC area.

[scottlichlyter]

Here's your shop located have you ever use KLOTZ TWO STROKE OIL, TRY IT.

[natureguppy]

your videos are the best, thanks as always

[keithbell]

Man thanks, I've been struggling with these issues on my 17 husky

[davemedsker]

Every time you make a video my '18 TX300 gets more awesome. Thank you so much.Main from factory was 450, now down to 430 and want to lower needle but seat oring is shrunken/ worn out. Factory specs have nothing for needle position 1, can't wait to try it.

[avigaray]

Great video !!!! Thanks a lot for sharing. I have a husqvarna te 300 and had the same problem.

[rglce]

Mine was good, it had the one with 3 holes in it on the one side. 03 cr250. I put the JD one in anyways.

[igorexas]

i run needle from outlaw rebuild kit for Honda cr250r 04-07 cr250 late models use same carb and works well cost for that kit $ 20-25

[henningjung]

Hi... I have been having problems with my KTM exc 300 for some time now. i will get that kit and see how it changes. down here in the Dominican republic

[MrSTEALTH]

Are you running this jetting at 40:1 like you mention in some of your other videos? And staying with br7es plug?

[rearwheelslider]

The needle is shaped like that to be lean everywhere except WOT. That shape makes the transition terrible... Thanks EPA/CARB...

[enmerdeur]

Wow that seems uber lean on the main for a 250. Might have try going leaner on my 300. Thanks for the info.

[nickschoenly]

Dude clean your glasses! Lol great video thanks buddy

[farmer]

What is your opinion on full synthetic oil vs semi synthetic and oil ratios. My mechanic said full synthetic is better for top end and semi syn is better for bottom end. He runs motul semi syn at 33:1. Iv been running motorex full syn at 50:1. What do you think?

[jaquecousteau]

Great video! I need to jet my 2002 kx 125 just bought the jd jet kit, just put an fmf fatty, fmf shorty and the boysen reed rad valve on the bike, I also live in the east, any suggestions? Now it falls flat on its face after about 3000 rpms at the beginning of the powerband, all jetting is stock now, .

[rsendurouk]

Great video. I instolle JD block kit and JD jetting kit on to my KTM 300xc 17 for sea level PJ30 blue needle #2.5 MJ 420 but it's way to rich for technical trails... What would u recommend to go for... just trying a PJ 27.5 blue needle #2 MJ 410... Is that the way u would do it or just swap needle for red...

[gustavob]

Please, I need help with my mikuni, here in Brazil there are only 300 carburadas, including 2020. Which set up do you recommend? Altitude 600 to 700 meters and temperature 26 degrees celcius ... tank you !!! ✊🏻

[FourthWayRanch]

why are people saying you don't have to fool around with jetting on this carb if you changed the main?
did jd stop selling kits for these carbs?