How do you fix the Mikuni TMX 38 Carburetor?

[@AnastationAero]

Hi, Morgan. My name is Anastassia, I m from Russia. I ride husqvarna tc 125, 2018. For a long 3 years I hated my mikuni, many sparks gone to the trash can. When I watched your video, I saw the light. I cleaned my carburetor and replaced the gaskets. Today, at the first training session, I smelled victory! Thank you very much for sharing your experience!

[@highlandcycles]

Awesome to hear

[@scottphillips445]

Brap from the United States!

[@scottphillips445]

If you try a keihin pwk carburetor 36mm (trail riding)or 38mm (racing) you will forget about the tmx. The tmx is harder hitting the keihin is broader and the keihin runs better

[@scottphillips445]

File a notch in the slide and it will run even better

[@John-B-Goodenough]

@@scottphillips445don’t file dick dum dum. Not unless you have another slide. Or just peel off for a lectron carb or some other modern carb. Or just learn the in’s and out’s about tuning your carb.

[@artbrunazzi2694]

Hey Morgan, followed this video to a T and my bike is better than ever! JD Jetting owes you a commission for doing this video! Thanks!

[@highlandcycles]

Great to hear

[@andrew2314]

Hello! Just want to say thank you so much for this video. Have been chasing this problem for 2 years! Never knew this part even exsisted on these carbs.

[@highlandcycles]

Glad it helped!

[@michaellovelace3062]

Really appreciate you putting this video up. I have a 2022 Husqvarna TC 250 and could not figure out why my bike started running terrible and fouling plugs. I bought a JD jet kit and the jet block gasket kit after watching this and my bike runs awesome after the install! Keep up the great content!

[@highlandcycles]

That is rad to hear! Pop Wheelies!!

[@2smokes]

Yo how did the bike run did it run rich?

[@MakeItHappenOriginal]

this is what I needed. I have faith in my mikuni. been fighting the seat o rings but now realized may also have bad block gasket. excited to clean up my jetting and get this thing dialed.

[@MakeItHappenOriginal]

I installed the jet block gasket, and O ring for the seat, for some reason when I replace the o rings they keep shaving off a tiny bit when I push it down. Even with a little oil for lube. Kind of unsettling. I went with JD jetting Rec and did a few of the Jarvis mods. I will say the new needle smoothed out that 1/4 to 1/2 blubber pretty nicely. Zero throttle hesitation and really crisp feel throughout the RPM range. I still have a bit of detonation so I’m thinking my squish is shat. Torn between the rk tek head/ milling my head at a shop/ trying a thinner base gasket. Ofcourse I always want the budget approach but In the long run it always seems like spending the money once makes the most sense 😑 thanks for all your vids man been a big help 🤙🏻 God bless

[@jooona9905]

This dude spitting straight facts! My husky was leaking gas from overflow and it was the float needle seat o-ring.

[@highlandcycles]

Awesome, glad to help

[@gary444]

Hello from Scotland! just about to do this to my own KTM, had endless issues trying to jet the tmx and finally found out about the JD kit.. fingers crossed it cures it! Thanks for the video

[@highlandcycles]

Right on. It will help a ton. You’ll probably love that carb afterward

[@Jrod_FPV]

How is it after the mod?

[@speedybikelife7475]

Thanks dude i have the 38 tmx on my yz125 and it indeed dumps fuel out of the overflow now i know how to fix that issue for good.

[@jermainescallionjr6946]

Yz125 with 38 tmx. Falls on it dang face. New jet,needle and gaskets. No leakage just bogs. You had this yet? Saw the 2022s went to Kiehin in them

[@speedybikelife7475]

@jermainescallionjr6946 you also did the gasblock gasket from jdjetting?

[@thomaslockley81]

Did all of these fixes to my 17 300 including the 2018 jets and needles, always felt a bit weak off the bottom to mid, a 575 slide helped a lot but the bike didn't come alive like a 300cc 2 stroke should, put keihin 38mm on and BOOM!! Exactly what a 300 should feel like, clean and powerful

[@highlandcycles]

Agree. Kehin is the way. This is just less expensive and makes it work WAY better than stock.

[@shogun678]

@@highlandcycles do the Graham Jarvis modifications to the tmx and the 300 comes alive!!

[@highlandcycles]

@@shogun678 I have since put a 36mm Kehin and all of RK Tek’s stuff on it. It’s a fire breather now

[@scottphillips445]

After all the tuning I have done to the mikuni I am running keihin exclusively. The next owner of the tmx I have should appreciate the filed slide, the jet block and O ring kit, and the float height!

[@chriskosin472]

Excellent video, thanks for taking the time to teach everyone about these carbs and the jetting requirements

[@highlandcycles]

You bet

[@legowolf22]

Just got a '19 Husky 2 stroke. Gonna do this during the snow time before even breaking it in this spring. Should have an easy time jetting it if I do this first. Might do the jet kit too

[@highlandcycles]

Patty McDude heck yeah. Congratulations on the bike. I highly recommend the jet kit. It will make your life easier and the bike will run great and get great fuel economy.

[@mayelo38]

I have the TX 300 2019 and I want to jet jD kit

[@highlandcycles]

@@mayelo38 It is a great kit. We can ship you one

[@mayelo38]

@@highlandcycles ok do you have website I can buy it or can I order by cellphone

[@highlandcycles]

Mayelo Villalobos phone is easiest. 970-240-2197

[@nickschoenly742]

I've always been told you need to measure your float height while holding it on an angle so the needle spring isn't compressed. It seems like you're holding it near straight upside down and the spring is compressed. Any insight on that??

[@highlandcycles]

Nick, you are right. That is a better way to do it, it was just hard to show it well that way.

[@SBNC0]

Really silly question, but if you’re missing the little metal clip on the float needle. Could that prevent fuel from filling the bowl?

[@highlandcycles]

It could

[@farmer3242]

Man you are one helpful dude! Thanks

[@SuicidalEnduro]

I have a 2018 ktm 300xcw 30 hours been giving me issues out of nowhere i pulled it apart the gasket and o ring were junk i got the gasket and o ring kit and jd jet kit on the way. huge help thanks allot

[@highlandcycles]

Awesome man

[@pawerRanjerah]

Did it fixed the issue?

[@250race]

The 6chy12-82 needle is the key for it. I've the 65 and the 69 needle But Hans down the 82 it the key to these carb. 2004 cr250 6chy12-82 I will up the other part numbers tomorrow. Good video

[@herdfreak2]

Great video, I just rebuilt a 2001 Suzuki RM 125 and working on getting the jetting correct.

[@highlandcycles]

James Boreman right on. You’ll get it.

[@herdfreak2]

@@highlandcycles I’m using Pro Circuit jetting specs as a base and going from there, using your videos to learn how to adjust.

[@highlandcycles]

James Boreman awesome. Let us know how it goes!

[@herdfreak2]

@@highlandcycles I’m going to drop down a pilot jet size, run the air screw at 1-1/2 turns out.

[@highlandcycles]

James Boreman right on

[@wyatts485]

Hi, my name is Wyatt I was having gas pore out of my over flow and it was driving me crazy I couldn’t find out what it was now I now it’s that oring. THANK YOU

[@highlandcycles]

Awesome

[@neoretrophoto9198]

I’m excited to try this on mine - Te 250- felt it ran alright but started to leak - I’m going to do what you show here and give it a try- I also have a PWK 38 and it’s also leaking on the stand despite adjusting the floats. Now I wonder if I should have gone for the TPI! Both carbs run well but I don’t like leaking gas.

[@highlandcycles]

Get them dialed in and you will be so happy.

[@daleduke3934]

Great! Just ordered parts on JD site. I’ve been fighting my 2022 gasgas mc250 for a few months. Hope this fixes my jetting issues!

[@highlandcycles]

That and the jet block gasket will do it.

[@daleduke3934]

@@highlandcycles nailed it! Last few rides have been perfect! So glad you posted this fix! Thanks!!!

[@highlandcycles]

@@daleduke3934 YES!!

[@AaronLivers]

What were your symptoms? My bike was running fine and gasket does look good but can’t even ride it Boggs so bad and it’s a fresh top end

[@craighoffman6876]

Nice video! Could be the reason the pilot is so lean is the needle has that crazy taper. Anyway, as you said, it is wrong - LOL A friend has a TX and did these mods, his bike runs great. Nothing wrong with this carb after completing some inexpensive and pretty easy to accomplish tweaking.

[@highlandcycles]

Absolutely

[@MrMetalhead0124]

I own a 1996 WXC 250, could you give me the part numbers I need to rebuild my Mikuni TM 38 carb. Thank you and great vid!

[@jonburtness9313]

Just ordered the jet kit from the link in your page. Hope you get support from them! Kind of funny that the product description says "custom Multi-Taper needles". Sure looks like the stock one was multi taper and the JD Needle looks more like a straight taper. Either way, great video!

[@highlandcycles]

Thanks a ton and yeah, it’s weird about the needles. I really don’t understand why any company would use the needle that came in the carb.

[@farmer3242]

I see on the jd instruction sheet it only lists a 32.5 pilot jet for all elevations. Whats the stock size pilot jet in 19 250xc mikuni tmx 38, and can you get a smaller one?

[@BluecollardollarFishing]

Definitely definitely helped my te300

[@BryanStarks]

Appreciate the video, as I'm about to perform this on a TMX for my new YZ125X. Amazing how bad they are from the start.. I'm guessing there are a bunch of TMX's sitting in OE inventory waiting for new bikes, and the seals harden and go bad once they get fuel.

[@highlandcycles]

Agree. They are terrible stock.

[@kylebecker9787]

@@highlandcycles having problems with my yz125x also. ordered the replacement gasket from JD and will be replacing later today. any tips? did you have to pull the carb off of the bike?

[@highlandcycles]

@@kylebecker9787 yes you need to pull it off. It’s easy though.

[@kylebecker9787]

@@highlandcycles I replaced it last night. the original was absolutely deformed. no issues with install and it seems to run better. I actually used a little mountain bike suspension grease to get the gasket to stick for re install since its very light. I do have a question though. the new gasket from jd - the rectangularish cutout at the top. should the raised bit with the two little holes on the piece it installs against fit into this area so that the gasket sits completely flush before install? mine didnt and sort of sat on top which is why i had to use grease to keep it in place and I assumed once its installed and tightened then it will press nicely. i tried to press it flat with my fingers to get this area to pop into the cutout on the new gasket but it wouldnt go. really hoping i did it right and that the shape of my new gasket wasnt off or anything

[@highlandcycles]

@@kylebecker9787 you should be just fine

[@jaspeed1717]

Right on man! Thanks for the help!

[@highlandcycles]

Thanks for watching

[@farmer3242]

Iv put a jd kit in my 19 250xc, im trying to sort the pilot circuit, when the air screw is 4 turns out it seems to be best, when its 1 and a half turns out its a bit burbly, feels rich just off idle. Do i need to go down a size on the pilot jet? Mid and topend feel good. Iv been told by a mechanic to run motul semi synthetic at 35 to 1 ratio. What do you think?

[@stevieackerman4290]

What do you recommend for the jetting sizes on my 2021 150sx? I’m at about sea level

[@highlandcycles]

I don’t know sea level well but I’d probably go stock or one richer on main. Stock pilot, needle #3

[@stevieackerman4290]

@@highlandcycles thank you. Just picked up this 150 with 3 hours on it. It sputters in the low power range. Really close to buying a lectron but if this JD kit will fix it then that’s a lot cheaper

[@lukepato76]

Thanks for the advice and awesome tips ! I have a 2021 ktm 125 SX . Same deal as everyone else. Massive bog at bottom end. So I watched your video. Ordered jet block kit and Jd kit. Did jet block, AU sea level. So blue needle clip 2 as we are doing trails . 32.5 / 460. 1.5 turns. Unfortunately still got same problem. Bike has 4.5 hrs total. So basically brand new New fuel 40.1 , new plug Bike starts first kick, idle perfect. First 3 gears big bog before power band, 4.5.6 super clean . I’m lost with this bike . Everyone saying it’s the slide as it 4 and should be 5 at least . And needle jet shold be s4 not s7 .any ideas anyone? Power valve issue ? Electrical issue. Or just it’s a shittt carb .funny thing I have a 2016 300 . Never ever touched the carb , never jetted or done a good dam thing and the bike is absolutely flawless. 2016 85 my kid has same deal flawless. To me that says everything about the carb and not the bike .

[@highlandcycles]

Seems like it’s lean down low. That isn’t the greatest carb, that’s for sure but it shouldn’t do what you are talking about. For grins, try going up 2 sizes on the pilot and give it a rip.

[@lukepato76]

@@highlandcycles thanks so so much appreciate you responding to me. It’s greatly appreciated. Took it for another rip today, had little play with air / fuel screw . Took it out to 2 turns from 1.5. So I thought that was going from rich to lean . ?? and had some more improvement. Got fair bit of improvement still and little lag from 1 to 2 .. 2 to 3 after that is actually pretty dam good . However got lot of spooj …Which I thought was rich not lean. I thought I was on the pipe 😂😂Definitely has improved after jet block and JD jetting and 2 turns . So to ask you another question. JD only come with 32.5 . So are you saying got put in the ktm PJ #37.5 ? With getting spooj and slight improvement from 2 turns out . Thanks agin ….

[@highlandcycles]

@@lukepato76 well if you’re improving by leaning it out, then try the other way. Maybe put a 30 in it. It’s so hard to guess over the internet without hearing or riding it. But you’re doing the right thing. Just keep going one way until it quits getting better.

[@lukepato76]

@@highlandcycles thanks a bunch…. Appreciate all your videos and responding. Ok we will look at the PJ … for sh.t and giggles and see if it improves or not it’s seems now it’s just down to some fine tuning…as it’s hell of a lot better after what you say to do on your video. As it needed a good brap… Love your videos mate. Thanks 👍

[@georgecarmel6114]

I checked on SUDCO parts list for the TMX (late style) on page 198 of catalog and they don't even show the jet block break down and no parts on list for the gasket.

[@highlandcycles]

I know. Have to buy it from JD jetting

[@farmer3242]

I just looked at stock pilot jet with my phone camera and zoomed in and its a 35. Can you go smaller than 32.5?

[@highlandcycles]

Yes

[@samozamene1]

for riding 1000-3000ft and temperatures between 20ºF to 50ºF, what would be your recommendation? right now i ride red needle 3.clip pos, 410 main, 30pilot. KTM EXC 300 2017 .. Ty

[@highlandcycles]

I would go to a 420 and run it!

[@craigdecker2219]

What are you asking for the carb I have a 2007 rm125 with the Mikuni TMX 38s carburetor mine seems to be not starting I can leave it overnight the next day or start my running around the block will stall out can't get it started again next day same thing

[@highlandcycles]

I’m asking $150

[@kimchaves5271]

Morgan i have a big problem with the mikuni , he is wasting a lot of gas, trowning away by the overflow hose, do you know how to fix it? Help me! Rsrs

[@highlandcycles]

Set float height and replace o ring on seat

[@scottphillips445]

Yo after I did the jd jetting jet block and o ring i filed a notch in the slide and now it runs better. The tmx I have is damn near new and so it came from the factory in shitty condition.

[@DavidMartinez-uz2vf]

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

[@highlandcycles]

Yes

[@DavidMartinez-uz2vf]

TMX 38 did not fir on the boot for my YZ 125@@highlandcycles

[@green461]

if the float height measured when the needle spring is in or out just touching?

[@highlandcycles]

Just touching

[@kawey]

What is a good replacement carb for a Husqvarna cr125! 2006 model!

[@highlandcycles]

Kehin 36mm PWK

[@ghost_sierra1600]

What size jets would you suggest for a 2002 yz 125? I have a 410 and 40 now

[@highlandcycles]

What elevation

[@ghost_sierra1600]

@@highlandcycles pennsylavania

[@dwdboardz1030]

I have a 2001 kx 125 with a muniki tmx carb. She ran last year, But it would spit oil out of the silencer pretty bad. Now this year, I’m fouling plugs and can’t keep it going for more than a few min with a new spark plug in it. Do you think this is my issue ??

[@highlandcycles]

Definitely could be

[@comtzu50]

Hi Morgan, my son's 2017 Husky TE150 does not run well (Mikuni TMX 38 carb). Has a good top-end, but hesitates a lot on bottom. I got the JD Jetting kit and instructions said for above 8,000 ft to use 32.5, 430 and red needle with clip at 3th notch. Kit came with main 430 as smallest, 12,000ft is my average altitude, what setting would you recommend? Thank you!!

[@highlandcycles]

That main should be ok but you could go to a 420 for sure. I’d run the red needle in the #2 though and then tune your air screw.

[@farmer3242]

I ride from sea level to 3000 feet, is it possible to jet the 19 ktm 250xc mikuni with jd jetting kit so it wont need any jetting changes within these elevations? Or even 0-2000 feet, thanks

[@highlandcycles]

Yes.

[@farmer3242]

Thanks, any idea what jet sizes i would need in it to do that? And do you file the slide and drill the 4 holes in the drain cap?

[@Gregg0112]

The kit comes with a thin ring that they want in the slide cavity. What is it for?

[@highlandcycles]

That is for if you want to do half clip adjustments

[@farmer3242]

Hi, what jetting and needle positions would you recommend with using jd kit on 2019 ktm 250xc mikuni riding 0-3000 feet? Thanks man you are awesome!

[@comtzu50]

Thank you. Very appreciated!!

[@highlandcycles]

You're welcome!

[@andremardian3532]

Okay so I totally removed the red cage and ignition cover. Reeds are good. Unable to see light coming through and no oil present when stator cover was removed. With there being no oil present I am going to assume that the seal is not leaking.

[@highlandcycles]

Andre Mardian not necessarily. It can suck air in from that side. What does your plug look like?

[@jonny621]

hello I'm from Slovakia, you can't get the seal from us, any tip on how to replace it? on my Honda cr 250 2007, I have a problem that it has a lot of fuel, I ride it enduro, we are at 500 above sea level, I used pj37.5 (40); mj410 (420); level 8.5 (7.5)… I currently have a needle 6dgy12-82,… thank you

[@paulgonzales28]

I have a 2017 Husky TE250 with this carb. I live in bay area California. How should I set up this carbs setting to run best for my bike? Typically our weather is around 50-80 degrees.

[@highlandcycles]

I am not sure what the best settings for sea level are.

[@sptnk87]

Would this be good for a 2018 ktm 150 sx? I ride mx sand track, kinda deep sand and the manual calls for a 40 pilot and a 560 main jet? what I understand so far is that the jd kit is bought because of the needle. How would one setup the jd kit for motocross and sandtracks?

[@highlandcycles]

Correct about the needle. I would use the Blue needle from JD and probably those same jets that you mentioned. Would give you better throttle response I believe

[@jonathoncatterson8901]

In the kit of gives specs for trail riding or sand race riding

[@Sw_55]

Is this the same carb as on the 2020 yz125? Because I know it’s a mikuni instead of the kehin

[@highlandcycles]

Yes

[@MagisMoto]

Thanks for sharing new friend here sending my support

[@highlandcycles]

Thank you so much!

[@bernarddenijs5733]

I have a tc 125 2020, lots of sputter in mid trottle. Is this kit good for my bike? Many thanks!

[@highlandcycles]

Yes

[@bernarddenijs5733]

@@highlandcycles I want to order it but I am from Europe (belgium) and it cost 70 dollars with shipping :(, do you know where I can buy it in europe? Many thanks

[@highlandcycles]

@@bernarddenijs5733 I don’t, unfortunately

[@andremardian3532]

Leaking internally? Not sure. However now that you bring up the choke. When the choke is left on the bike runs fine.

[@highlandcycles]

Andre Mardian they can leak internally but that makes it sound like you have an air leak. I wish I could help more.

[@rv6541]

GREAT VIDEO !! Can someone please tell.me bcuz I'm shopping as we speak...is this carb any good on a 4stroke? Specifically a dr350...and YES...I know all about the tm33 pumper.. Like 1 000x I've read about it. Will the tmx work also?? I'm able to get one easily . Thank you !!

[@highlandcycles]

It would be ok but not great on a 4T

[@stephend3981]

Morgan little help please! I've got a husqvarna tx300 2017/2018 I can not identify the year ,which is causing a problem trying to order a jd jetting ki! 2017 and 2018 are 2 different jd kits. Any thoughts on identifying the correct age

[@highlandcycles]

The 10th digit in the VIN is the year. It’s going to be a letter. H is for 2017 J is for 2018

[@stephend3981]

@@highlandcycles Got it 2018! Appreciated thanks 👍

[@kickstarter.Dmitry_Koblov]

hello. what is the difference between a red needle and a blue one

[@highlandcycles]

Red is leaner so fatter

[@kickstarter.Dmitry_Koblov]

@@highlandcycles that is, the red needle is rich, and the blue is poor?

[@kickstarter.Dmitry_Koblov]

Получается синяя игла беднит, а красная богатит

[@kickstarter.Dmitry_Koblov]

Или синяя игла богатая, а красная бедная

[@kickstarter.Dmitry_Koblov]

???

[@andremardian3532]

Desperate for some advice. So I have a 2018 300 XC-W with the Mikuni carb. I've done the same update's as your video shows and at this point Im at a loss. I went for a ride last weekend at about 8000ft. I have the bike jetted per JD jetting for that altitude. The issue Im having is that number one, the bike wont idle no matter how much I mess with the air screw or idle screw. The engine will fall flat on its face any time you try to give it gas and I've had a hanging idle concern since day one. Air filter is clean, reed block cage is tight and I even disassembled and clean the carb incase any dirt might have gone in there. Any advice before I throw this mikuni in the trash? Thanks..

[@highlandcycles]

Andre Mardian dang it! That is not normal at all but sounds like you have an air leak. It would be weird but you might have a leak in the left side main seal. I would take that cover off, run it and spray some brake cleaner or like substance in there to see if it changes the running. You can call us at 970-240-2197 if you’d like to talk about it.

[@justinsawyer9836]

Thanks for sharing. I do have a question. I just put a JD Jet kit in my 300xc. The kit came with a little ring. Not the spacer washer FYI. Wasn’t really clear in the instructions but I believe you are supposed to put the in the top of the slide and then the needle in the correct clip position for your elevation. Did you do that on this carb or did you leave that out? What does that ring do? Thanks in advance.

[@highlandcycles]

Justin Sawyer great question. That ring is to use when you use the shim. If you look in the instructions you’ll see it. If you don’t use the shim you don’t need it.

[@justinsawyer9836]

Ok thanks. Yes at my elevation it did recommend using the shin so I did put it in.

[@highlandcycles]

Justin Sawyer it goes around the shim.

[@joslinnick]

I installed the jet block gasket, but I'mm still using the stock needle. The carb is functional, it just doesn't make my Husky feel crisp. It's like I can only get it jetted 95% properly. It's really unsatisfying.

[@highlandcycles]

I would try the JD needle

[@nardo5056]

hello, but is the carburetor still available? because if so I would be interested in buying it

[@highlandcycles]

It isn’t.

[@andremardian3532]

When you say left side. Are you talking clutch side or stator side? Also could an issue with the reeds themselves cause this issue?

[@highlandcycles]

Andre Mardian left side is ignition/stator side. And yes the reeds could be causing the problem. I thought you said you had checked them. I would check the for sure

[@mschumaker1]

Is the jet block gasket kit necessary for the 2019 bikes? They made some changes - wasn’t sure if this was addressed or not

[@highlandcycles]

Mike Schumaker it is still necessary on the 19’s

[@mschumaker1]

Thank you for the feedback!

[@jenpsakiscousin4589]

Can you swap out the emulsion tube on a tmx35 especially an old style flatslide tmx35.

[@highlandcycles]

I don’t know. I’ve never tried it.

[@jenpsakiscousin4589]

@@highlandcycles I might order one from sudco, I got an 89 Yz I'm redoing and that carbs emulsion tube looks like an egg instead of a round tube. Probably better to just get a whole new carb tho.

[@highlandcycles]

Bernie Lomax maybe. But if everything else is good then you might as well re build it.

[@FourthWayRanch]

That TMX you have has the 3 oval slide shiny but it looks like the ones you can order now TMX38-18 have a black slide?? it's all the three oval new design tho isn't it? I hope the 38 will be able to replace a mikuni VM36 and not be too big.

[@highlandcycles]

Should be the same design. Probably just a different coating

[@FourthWayRanch]

@@highlandcycles never mind, what I got was the old first gen tmx, doh! , that's all you can get aftermarket sudco told me anyway.

[@MrArdzej]

You think for KTM 250sx main jet 420 and pilot 42 will be good? i have now 445 main, pilot 42 and works good but i didnt checked sparkplug jet

[@highlandcycles]

What is your elevation?

[@MrArdzej]

@@highlandcycles 160-300m

[@highlandcycles]

@@MrArdzej sounds like you should be good with what you have

[@MrArdzej]

@@highlandcycles thanks ;) +1sub

[@highlandcycles]

@@MrArdzej thank you.

[@davemartin1399]

Thanks for the great video it was super helpful! I have a 2013 husky cr125 and I can't find the float height in the manual. Is 8.7mm recommended for all models that use this carb?

[@highlandcycles]

I think so. I have been setting them all like that. Yz125’s have the same carb too.

[@davemartin1399]

@@highlandcycles Thanks for the help! I'll give it a try and see how it turns out. I'll let you know how it works.

[@highlandcycles]

@@davemartin1399 Awesome

[@pawerRanjerah]

My 2017 KTM xc300 is running like crap. And it started out of nowhere. The Little button on the top of the fuel needle on the float gave up it has no resistance, i cleaned the carb i adjusted it as the book says and nothing. It only runs good momentarily when you are on 3rd gear and 3/4 of the throttle. Idk what to do. I ordered a rebuild kit and the jetting kit to see if that fixes my issue.

[@highlandcycles]

Make sure you replace the jet block gasket too

[@pawerRanjerah]

@@highlandcycles i bought that as well I'll give you an update when I replace it

[@pawerRanjerah]

I did everything you did. It runs way better but still runs like crap

[@highlandcycles]

@@pawerRanjerah huh. Not sure how it’s running but it seems like maybe something else is causing it. Maybe check the ignition system. I’ve chased lots of “carb” issues that ended up being electrical issues.

[@pawerRanjerah]

@@highlandcycles it's spluttering. I know now it's not th carburator. Feels like it's misfiring. I put in a new sparkplug just to be sure but still does it. It might be the ignition coil or maybe cdi

[@tuffstuffs]

What's your thoughts on changing the slider to a #5 as opposed to the #4 that's comes standard?

[@highlandcycles]

I like a leaner slide.

[@tuffstuffs]

@@highlandcycles ordered the jet block kit aswell after your video. Hopefully that and the #5 slider (leaner) will fix it 🤘🏻 keep you posted

[@tuffstuffs]

Will I be ok to run the stock 30 pilot and 470 main with the number 4 slide? Riding in the uk

[@mschumaker1]

Also , no mention of modifying the slide with v groove?

[@highlandcycles]

Mike Schumaker I don’t do that mod. Haven’t felt the need. Bike runs perfectly without doing that.

[@lucianobragho3088]

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?

[@highlandcycles]

yes

[@bernarddenijs5733]

I have the same problem, did you solve it?

[@rkprecisionproducts8575]

Hi, I use tm32 for my air cooled 250cc bike. The problem am facing is, the engine in off condition if we give the throttle means the engine gets richer and takes so many kicks to start. Kindly give me a solution...

[@highlandcycles]

I’m not sure I understand. Sounds like you need to not give it throttle. How does it run when it’s started

[@rkprecisionproducts8575]

@@highlandcycles thanks for your reply.. Thing is when someone or my kid rotates the throttle when the bike is in parked/engine off condition, some amount of gas enters into the engine and got richer and I have to remove the spark plug kick the engine to release the gas.

[@highlandcycles]

@@rkprecisionproducts8575 that’s odd

[@mareksodyczka5630]

Hi. What needle jet you use in your carb? R8, S1 maybe something other?

[@highlandcycles]

I use the JD red needle.

[@mareksodyczka5630]

@@highlandcycles The 2017 Mikuni TMX carbs come stock with R8 needle jet (55431021000 KTM part number). 2018 bikes comes stock with S1 needle jets (554310211100) Some people using S1 needle jet to 17 model (I think S1 is little reacher). My question is : *What year model bikes is your carb ? *Your needle jet is stock or you replace it?

[@highlandcycles]

Marek Słodyczka gotcha. Misread your message. I was thinking needle, not needle jet. Our bike is an 18’ 250XC-W and the needle jet is stock. Runs great and gets almost 100 miles out of a tank.

[@mareksodyczka5630]

@@highlandcycles Thank you for info. Your videos are awesome, keep it up bro 👍✊🤙

[@highlandcycles]

Marek Słodyczka thank you for watching. So you know, I’m the kind of guy that once I get a setting I like I leave it alone and don’t keep hunting.

[@woodworm3615]

I have a question about the "Colder-Tempurture" rides.Ima TMX 38 on a 19 ktm 300 xc.... I have done the JD kit already. JetBlock was trash! Im riding between 2k-7k Red Needle 30 Plt. 3 position 420 main jet NGk Spark plug BR7ES (comments on plug welcome) Question: Should I lean out more (screw) for colder temps riding? Im 2.25 out now on air/mix now. Thank you.

[@highlandcycles]

Normally you richen things up for colder weather. Cold air is more dense therefore you need more gas.

[@woodworm3615]

Do you prefer the NGK BR7EIX plug then the 7ES?

[@highlandcycles]

I don’t really care about plugs much. I use the cheaper one because I don’t see much advantage to the iridium.

[@woodworm3615]

The Mikuni is working just fine with the Brapp'er at the moment. Do you like any other Carb that is simular or better then the TMX-38's? Just curious?

[@highlandcycles]

@@woodworm3615 I think the Kehin PWK is my favorite

[@earlninofranco6413]

Is it the same with CR 250 Mikuni carb issues

[@highlandcycles]

They don’t seem to have the same problem but it’s never a bad idea to replace that gasket. I think Honda uses a different needle.

[@davidnnn96]

Does anyone know if the jet block issue affects all TMX 38's or just on Husky's and KTM's? I never looked at mine on my YZ but haven't noticed any weirdness with the tune.

[@highlandcycles]

dnorman it can effect all of them but it seems to be a much bigger issue on the Austrian bikes.

[@warrenhicks4683]

Hey man! What kit did you put in the carb was it the JDK038? I have a 2017 300exc was hoping to do the same as the vid. Also what elevation you guys riding at for these size jets?

[@highlandcycles]

It was the JDK038 and we are at about 5500 feet and up here.

[@warrenhicks4683]

Thanks man! I ride at 1000-2000ft and in the uk would this set up work?

[@highlandcycles]

Warren Hicks the kit would work great. You would run a different main jet and needle but they come in the kit

[@michaelgarland579]

Whats the part number so i can order it

[@highlandcycles]

Not sure. It’s on JD Jetting’s site

[@michaelgarland579]

@@highlandcycles I found it on ebay

[@lbeck119]

MY MAN!!!!!🤘🤘🤘

[@АдемЗърбашев-ы8й]

Can you tell me the settings for 500 to 1500m altitude and 10 to 30 degrees Celsius air temperature? Thanks!

[@devonrose888]

What needle jet do you prefer with this set up?

[@highlandcycles]

Devon Rose I run the stock one. I’ve never felt like it needed a different one. I know folks are switching them up but our bike runs great

[@devonrose888]

Which year is this bike? On my 17 I ran a 32.5 pilot and on my 18 with the updated needle jet I run a 25. It makes a big difference. I’m at 2500-5000ft 90% of the time.

[@highlandcycles]

Devon Rose I don’t remember what year bike this carb came off of. It’s now here for sale if anyone wants it. We will adjust for bike and elevation. Our bike is a 2018 250XC-W and I run the 32.5 and it runs great up here at 6k and above. We get 90 miles to a tank and it’s crisp.

[@Professor_Bernie]

What did you do with the second o-ring that came with the kit?

[@highlandcycles]

Save it for future use

[@MasterBlasterSr]

where is your shop?

[@highlandcycles]

Montrose Colorado

[@Audioworx1]

Morgan, do you recommend doing the KTM tech tip to tilt the carb 7 degrees to the right? Saw a tech update from KTM direct before the JD Kit became available.

[@highlandcycles]

Peter Magee no, no need if you get all the stuff in it and set the float height correctly

[@Audioworx1]

@@highlandcycles I watched three of your videos on the carb set up. Could not really see what you were doing to set the float height. I understand bending the tang. But when you hold the carb upside down, should the float REST at 9mm?

[@highlandcycles]

Peter Magee I need to shoot a better video of that. What you want to do is get it so the lowest part of the float is 9mm below the surface of the carb body right when it closes the float.

[@davidbible9110]

Hey Highland !... if you get a chance can you reply? My bike is 2020 Yamaha 125X with stock mikuni TMX 38. I live on front range and ride between 5k and 10K. I just jetted stock mikuni with JD Jet Kit. Conditions were 57 degrees and 7,200 feet. Mid and top run great with Red Needle in 4th position and 400 Main. Only trouble i'm having is bad bog when cracking throttle off idle. Pilot jet is 40. Any idea how to clean up bog off idle? THANKS.

[@highlandcycles]

David Bible I would try putting a 42 or 45 pilot in. Sounds like maybe. Lean bog. I know it’s counterintuitive but a lot of times you have to richen up the pilot jet at higher altitudes.

[@highlandcycles]

David Bible uf that doesn’t help, Ir makes it worse, I would try dropping the needle down (raising the clip). It’s hard to diagnose without hearing it or riding it but that could be on the rich side.

[@davidbible9110]

@@highlandcycles Oh ok, i'll give that a try. I was going to start down-jetting pilot from 40, but I'll bump up to 45, then work my way down from there if needed. THX!

[@davidbible9110]

@@highlandcycles Ok, i'll start with the pilot recommendations from your last reply. If that doesn't help, I'll drop the needle one slot. thanks again!

[@highlandcycles]

David Bible you bet. Please let me know how it goes.

[@at1asru]

IMPORTANT: When measuring float valve height, carburator must be 60 degrees position. As it was shown here is wrong, because carb is 0 degreease position... And where did you get that 8.7 mm level?

[@highlandcycles]

You are right about the angle. I responded to that in another comment. That level came from either JD or somewhere else like that. I can't remember. Obviously it is almost impossible to measure .7 of a mm with a machinists rule but I like to shoot between 8 and 9

[@jenpsakiscousin4589]

The triple taper needles on the keihin pwk carbs and keihin fcr carbs work great, provided you got the right one with the right slide cutout. Otherwise they get flatspots in the power curve.

[@highlandcycles]

Yeah. The JD one is just simple and works great

[@joshb1476]

Got one for a te150.

[@highlandcycles]

They do have one

[@bikemancody2752]

Did you change the starting jet?

[@highlandcycles]

Bikemancody I replaced the pilot jet!

[@juanjerodriguezrodriguez9802]

Hola no me salen las piezas del carburador

[@andremardian3532]

To me the plug looks like the bike has been running a little on the rich side. Not quite a Carmel color but not totally black either.

[@highlandcycles]

Andre Mardian hmmm. That is really odd if you have everything else all dialed. We haven’t had any issues like that but there is always a first time for everything. The choke isn’t leaking is it?

[@throttlebuff]

"dreaded" lol

[@craigbickerstaff1519]

Hiya man. Heaps awesome videos! Would this JD kit work on a 2019 KTM 150xcw? Keep up the good work bud. Cheers Craig.

[@highlandcycles]

They make a kit for that bike

[@SaintChimera357]

I'm massively curious as to why Mikuni makes needles with the large taper. surely there is a reason. they wouldn't have done it for lols.

[@highlandcycles]

joe johnson hahaha. I agree. I have know idea.

[@Professor_Bernie]

I bet they did it to compensate for another component that is faulty in the carb. Like, instead of fixing the true problem, it was more convenient to quickly modify the shape of the needle to get them where they wanted in the cheapest possible way.

[@OJIAN31]

Rivew TM 38 bro

[@highlandcycles]

I will have to get one for sure.

[@rvsteve583]

those bracelets are distracting.

[@highlandcycles]

rvsteve583 😂🤣

[@martymcfly660]

that carb suck i try it all with it ist a piece of junk

[@highlandcycles]

It’s not awesome but mine runs pretty darn good. Not everyone is cut out for tuning.

[@Andy-co6pn]

Had the float valve oring give up on my 2001 cr250 back in the day when it was quite new. Almost.20nyeara later they are still having the same issue ? Pathetic

[@highlandcycles]

Agree.