Fixing the Mikuni TMX Carburetor

There are lots of problems with the Mikuni TMX carb and we can help you fix it so you don't have to spend a pile of money on a new carb!

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[woodworm]

No O-Rings under the 2 screws in the Jet-Block-Seal area. Just the updated Gasket from David at JDJetting. On the Float Jet. Yes there is a crapOlla O-Ring here. Change out just as you have done. Alles Klar mein Ami Mechaniker. Servus!

[rsendurouk]

2017 KTM 300 mikuni tmx38.
Starting jet 80
Needle jet r8
Idle jet 37.5
Main jet 440
Jet needle 43-73 #2
Great crisp sound no booge. Great bottom end and crisp sound!!! Do not need to spend £90 to get most out of it...

[herdfreak]

I have watched this video 5 times now and ordered everything from JD Jetting for my 2001 Suzuki RM 125.

[glenngertz]

My brand new 0 hours, 2019 Yamaha YZ125 with Mikuni TMX 38 has this problem as well. This problem is not exclusive to just KTM and Husky . Also the needle seat was wobbly in the carb body and leaking fuel, overflowing because of a shrunken seat Oring. 0 zero hours on this bike, crazy. These must be new old stock carbs like you mentioned. Thanks for the video

[arloslab]

I think I should buy one of these kits, My 2015 yz125 (has Mikuni tmx38) Has bogging issues, It rides normal but when I slam the throttle all the way down in high gear while in low rpm it bogs, maybe the needle ?

[scottlichlyter]

Were is your shop located at great show buddy

[Daniel]

What do you call this main jet screw in brass fitting? Where do you get the replacement o-ring at?

[FourthWayRanch]

I can't find a tuning manual for the TMX38 carbs. There is info in the catalog about them but no float height data?? did they make a tuning manual like they did for VM carbs?

[Aaron-fxzi]

I’ve ordered the jd jet kit for my 2020 250sx along with the oring gasket. Is there any thing else that can be modified ie the slide, float bowl or overflow tube?

[landonbutler]

I accidentally stripped the screws to the jet block. Do you by any chance know what kind of screws these are

[FourthWayRanch]

I just bought a couple of these, I wonder if they've fixed the bad seals issues yet?

[DavidMartinez-uzvf]

I have a 1996 YZ 125 with a TMX 36. Will a TMX 38 work cause im having trouble finding 36 parts needle n seat

[farmer]

Do you do the filing mod to the 2019 mikuni slide? And drill the holes in the drain bung?

[lucianobragho]

hey man i have a husqvarna tc 125 2018 and is very rich at medium revs, i’ve tried to recarb it but nothing, this kit is it also good for my bike?

[keesgroeneveld]

Nice video! could you advise what dimms yr o-rings are? does mikuni have that standard in? I have the mikuni TMX38/kawa kx125-05 and she is leaking gas. thanks

[stevemarquez]

Do you run pump gas? Looks like they are jacked by ethanol.

[jaybird]

Ever have any problems with the bike stalling during long downhills or during pivot turns? I have the mikuni carb in my 17 300 XCW. Put in the JD kit with jet block gasket and needle seat O-ring. Bike runs much much better than it did from stock, but have this stalling issue now. If the clutch is pulled in and it's sitting in first gear and I just lean the bike over to the right it will quit. My rpm is set properly, clutch is good, I'm leaning towards float bowl, but i've double checked that a few times now. Any thoughts?

[purasenatus]

Having a issue with my 2016 yz 125 bike has a high idle. Air flow is nearly closed if I open it the bike sound like it’s about to blow. Search for leaks none visble with the naked eye. Can anyone help ?? Or know that having any of these known problems from this videos would cause the same issue I’m having.

[enmerdeur]

Here is my theory: What bike used to use this carb? The old Husky WR250/300. After KTM acquired Husqvarna some KTM employee stumbled upon a warehouse from the acquisition with a bunch of Mikuni TMX's stored in there (think end of Indiana Jones for a visual). Who knows how long those things have been sitting in there. Said employee sees $$$$ and goes to the marketing department and says, make something up that makes it sound like switching to the Mikuni is a good idea and voila!

[evedanceexperiment]

You mentioned the needle problem. What needle should I use? Thank you!