VM24 Carb Swap - TTR125-More Power!

[@pineapplepissant]

Thanks. Helped me out with the vacuum port. Cut off a small piece of hose and filled it with silicone then stuck it on. Works perfectly

[@chaishmajel8570]

Hey man quick question, when you bought the carb did u use the link in the description or look up mikuni vm 24 carb. Because when i use the link in the discription it takes me to a page for a carb made for yamaha ttr 125’s but the brand is not mikuni. Ur comment is the newest one i can find so im askking. Thanks

[@pineapplepissant]

@ I looked it up I think. Either way, I spoke too soon because a few weeks later the float is sticking and it’s been pouring gas

[@trevorjameson3213]

Great video, helps tremendously! Now I know exactly what carb to get. Also, I never knew about that vacuum diaphragm at all. You gave a lot of great info, thank you very much!

[@trevorjameson3213]

Well, thanks to your video, I just got my new carb in the mail yesterday and installed it. My bike is a Suzuki DRZ125L and the carb it had was pathetic, just a puny little 20mm and it had that same diaphragm thing. I could tell the bike wanted to run, but the carb wouldn't let it. I couldn't find a 24mm that would fit my Suzuki, so I got the Mikuni 26mm instead. It was already jetted, so I just installed it and tried it out. Oh man what a difference. Started first kick, required a little adjustment of the fuel/air screw and idle, and it ran perfectly. Now the bike has some very good power.. It's amazing the difference a carb can make, this thing really rips now! I did remove the airbox snorkel too.

[@JBAutomotive794]

Government puts alot of regulations on emissions on motorcycle and off road vehicle manufacturers to keep smog numbers low and it usually makes for engines that are pathetically lean. An aftermarket carb like these will allow the carb to deliver much more fuel and allow the engine to make more power. (Dont tell the EPA)

[@trevorjameson3213]

James Bradley , yeah typical emissions garbage. It’s only 125cc how much smog can it really make Lol.

[@boogiekush9391]

Okay so I have a kehin pe 24 carb and it won't fit on my drz125L am I gonna have to do the same thing you did with your air box? I'm just trying figure out how to make the new one fit cause it just is a lil too big so the rubber part won't completely fit on . Would really appreciate your advice thank you

[@trevorjameson3213]

@@boogiekush9391 I'm using a Mikuni 26mm carb. It fits the rubber boots no problem. Suzuki's come with Mikuni carbs, so I just bought a larger Mikuni for it. You could do the same and it will fit. A Keihin carb probably will not work. As far as the airbox, yes, you will have to remove the snorkel on top of the airbox, very easy to remove. You can use the stock exhaust too. I jetted the Mikuni 26mm with a 170 main jet and whatever pilot jet was already in it. Then adjust the fuel/air screw as needed for best running.

[@richardwheatley8757]

Plenty of thanks on here and I'm another $17 delivered. I accidently crossed the solenoid and it started on tick over. Little bit of tuning now. Thank you.

[@srockriver]

yeah, this was probably the best explanation Ive seen so far on youtube. I would like more info on uncorking (ie creating more airflow) in conjunction with using this carb though

[@JBAutomotive794]

I've got a video in progress of exactly that along with others, stay tuned!

[@samwebb5251]

Thanks for the awesome vid! SUPER helpful not only for the ttr but also for a beginner to learn how to tune a carb!

[@JBAutomotive794]

Thanks, the pilot and idle adjustment procedure will be pretty much the same on all carburetors.

[@jasonluhmer4792]

@@JBAutomotive794 but there is no way to properly tune this carb, you cant get replacement jets for it. this carb is garbage

[@aZs300]

This worked like a charm. My ttr was always having carb issues and now it cranks over with one kick. I ordered the one listed in the description and it fit perfectly (after drilling out the cap). Thanks for the great recommendation and video!

[@JBAutomotive794]

Thanks for your support! Lots more videos on the way, subscribe so you don't miss any!

[@1chasehayez]

What year is your bike?

[@claesrmhakansson]

Great vid, thank you for postning! I still have the stock carb but the choke cable is broken and fuel is running through the drain tube at the bottom. I'm definately gonna swap now.

[@smokingcongojoe]

The 2 stroke VM 24 is a Best..give you hell lot more power.. can modify the Jett s in the VM 24 I ordered mine of amazon .for 26 bucks.. plus shipping..29 all together..

[@Quinton_treecutter]

I have this carb and have been trying to tune it and I didn’t even know about the hose you said to close I didn’t even know about I hope when I get the chance to plug it it will solve my problems

[@JBAutomotive794]

It causes a huge vacuum leak when that hose is left uncapped and will cause tuning nightmares. Put a cap over it and adjust your mixture and idle as described and i bet you will enjoy it much more

[@isaacdickerson9747]

Super helpful glad I came across this video

[@ram43x80]

You r a natural bro! Awesome video, u have to work for some big high tech company

[@babelgone]

I just did this and it works great! I have a 2015, so I had to be creative on converting from the stock dual throttle system. My vm24 is designed to reuse the stock choke, which I haven’t hooked up yet.

[@JBAutomotive794]

Interesting, i have yet to see a VM24 that utilized a remote choke

[@babelgone]

@@JBAutomotive794 I might be mistaken. I searched Amazon for VM24. Here’s what I bought: TTR125 Carburetor + Fuel Switch Valve Petcock for Yamaha TTR125 TTR-125 Carb Carburetor 2000-2007 Yamaha Motorcycle TTR125LE TTR125 TTR125E TTR125L by LIYYOO www.amazon.com/dp/B07V1H2JCP/ref=cm_sw_r_cp_api_i_r.GJFb392ARTW

[@JBAutomotive794]

That is a stock style aftermarket yamaha carb. Pretty much the same thing that came on the bike when new.

[@superhelicase]

@@babelgone Gotta love that algorithm

[@sethpark2539]

@@superhelicase I’m ok. My petcock was bad, so I got a working carb and petcock for the price of a petcock.

[@stampydragon2739]

The mikuni vm and TM carbs are both 2 and 4 stroke there designed to be used for both

[@patrickharding5061]

Best video on KZbin for this ttr115 carb swap thank you

[@FriendlyRider88]

I did this mod on my ttr230 but not the exact same carb mine is bigger, and it went from 16hp to 23hp but that’s of course with the biggest jets in it I could possibly fit lol. Also put a aftermarket exhaust on and changed the gearing.

[@tommybragalone7943]

How does it run having the biggest jets you could put in it?

[@KBMOTORSchannel]

Awesome video man.

[@eliterry3785]

Great video. Very helpful!

[@JBAutomotive794]

Thank you!

[@boogiekush9391]

Thank you explaining this !!

[@f308gtb1977]

Really appreciate this info, thanks!

[@siTTinLo]

Great video but I have one question. Just picked up two of these bikes but the small tire versions. I’m considering doing this mod. Could you please elaborate a little bit about the “drilling of the cap” procedure? What’s that all about? Thanks.

[@jackm88aus]

The hole in the carb cap which the throttle cable/elbow goes into may be too small on these Mikuni VM24s for the TTR125s throttle cable/elbow, so you need to drill the hole bigger. You can watch a video of a guy drilling a larger hole in the cap here kzbin.info/www/bejne/fJ7ZknaEeN2brqc or read about it here motocrosshideout.com/ttr125-mikuni-vm24-carb-swap-best-bang-for-your-buck/

[@JessupJon]

Thanks!! Just got this bike ,with a mukini carb,🙏

[@JBAutomotive794]

Awesome, how does it run?

[@Natedoc808]

The oem carb on these bikes is a mikuni, but they're absolute shit, so get the VM24, drill out the cap and you'll be good to go.

[@tommybragalone7943]

@@Natedoc808drill out the cap?

[@Natedoc808]

@@tommybragalone7943 yes. The cap on the vm24 doesn’t quite fit the throttle cable, so you drill it out to get the cable to fit through. I’ve been running the vm24 problem free for 2 years now

[@tommybragalone7943]

@@Natedoc808 ah gotcha. Do you remember what size drill bit you used? And did you notice a noticeable power increase with the vm24?

[@pauliemars]

Great vid man. Thanks. So when you run a longer fuel line.. it doesn’t matter if the fuel line doesn’t run downhill? You can run it down then up and around the frame?

[@HappyHermitt]

I'm looking at one for $700 and its only missing the carn. I'm thinking about buying it and putting a Nibbi in it.

[@HappyHermitt]

I found the same bike 8n very nice shape. Its missing a crab. Only $700 I'm thinking of getting it and slap a Nibbi PE24 on it.

[@johnmarin9490]

Hey how good is this compare to the nibbi carb ?

[@sniksnak8509]

Your video may help much more if you can provide ALL detail as: - what carb (EXACTLY ...genuine MIKUNI, clone, source....etc) - main jet, - pilot jet, - needle clip position - float position (mm) - needle number & - needle jet, - level above sea you are at ? ? ?

[@JBAutomotive794]

When you buy a modified clone specifically for the TTR125, they will come with the correct pilot and main jets installed. Clip position will account for things like altitude and engine mods such as exhaust or airbox mods. It has 5 available positions if your bike requires it. The carb i installed in the video did not require that I mess with the clip position.

[@cb400fhonda6]

I bought the colone carb and I plugged the vac port But above the cab there is another Outlet port that has vac and if its Plugged it kills the bike Otherwise it runs at atleast 2k rpms So that vm feebay colone Sucks in my case Also the intake side of the neck is Skinner and shorter so the carb does Not sit well Does not go enough inside Even after the clamp is maxed out So its a poor item from feebay Cheap though but junk I would not waste my money on Any copied vm carbs I will experiment with other Regular four stroke types

[@TexasNationalist1836]

I have the same bike and I am thinking of getting this aftermarket carb because the original carb quit working

[@demoman5506]

What kind of carb did you have before (the one in hand) it would help me a lot I have the same one now but don’t know the name, thank you

[@JBAutomotive794]

It was the factory Yamaha carb

[@f308gtb1977]

What size jets work best? My VM24 came with 30 pilot and 120 main installed, and I have all the sizes above and below both, but can’t find the right combo. Mostly the problem is instant bogging and frequently stalling as soon as you crack the throttle.

[@JBAutomotive794]

Different bikes will like different jet combinations due to altitude and other mods such as exhaust and airbox configurations. The "clip height" is also an important adjustment with this style carb as well. It controls how "quickly" the main jet fueling comes on compared to the idle circuit. There is no accelerator pump on this carb, which 4 strokes like. You may have to jet on the rich side to compensate for this design if you want off idle snappyness

[@f308gtb1977]

@@JBAutomotive794 thanks for the quick reply! Yeah I have tried almost all the jets and every clip height with no luck. Thanks again!

[@JBAutomotive794]

@f308gtb1977 make sure your spark plug isn't fouled and gapped correctly. Also make sure you don't have any vacuum leaks.

[@f308gtb1977]

@@JBAutomotive794 the VM I got doesn’t have a vacuum port, and the plug looks perfect according to all the charts. I did like you said today and jetted it almost as rich as I have jets for, and raised the needle to the next-to-highest setting, it helped a fair bit with the bogging, not perfect but less severe, only now it idles WAY high and can’t be adjusted lower. So that’s probably why it bogs less. But it’s a little more rideable so … if it’s the best I can get then I’ll live with it. Thanks again!

[@smokingcongojoe]

Need more information about the VM 24 are flow plus information on the air box modification..????

[@JBAutomotive794]

This bike doesn't have any type of airbox mods. It comes prejetted for the TTR125.

[@smoknjoe73]

I clicked on the link and was sent a different carb than was shown in this vid. I know this is an old vid but how do I find a vm24 like shown in this vid?

[@merqtv]

I did this mod. It took me two months to tune it perfectly but it starts on one kick almost every time

[@seabass420]

What type of tunning?

[@5.7_moto]

Was It by chance bogging at full throttle? I’ve been Trying to figure out what to else to do other then different jets.

[@rosebar536]

How to setup vm24 bro? Pilot jet = #? And main jet =#? Thankss you!

[@trevorjameson3213]

I have the Suzuki DRZ125L but it’s basically the same bike as the TTR125, and you can jet the carb as follows: Main jet 105, 107.5, or 110 (depends on your setup and altitude). Pilot jet 20 or 22.5 (again depends on your altitude and if you have it stock or un-corked). My bike is stock so I run a 107.5 main and 20 pilot, works good.

[@rosebar536]

@@trevorjameson3213 thanks bro, my stock carb ( xtz 125) is Mikuni Bs25 - CV carb, VM24 vs Bs 25, which is better, about power and mileage?

[@trevorjameson3213]

@@rosebar536 The VM24 is a great carb, as far as power goes. The Mikuni CV carb will get better mileage for sure, since it's a CV carb. I know fuel mileage can be an issue, but the 125's still just sip gas even with a bigger carb. But, the VM24 will definitely give you more power than the CV carb. People keep wasting money on pipes and airbox mods, and cams. But they don't realize that a bigger carb will make a real difference in power, and you can keep your stock pipe and cam.

[@boogiekush9391]

@@trevorjameson3213 I have the same bike and have a keihin Pe 24 that I bought cause I read a thread saying you should put bigger carb for increased power , also have a fmf pipe on it and everything else is stock. My question is I couldn't get it to fit it's just a lil too big for for the rubber part to go around it, do you have any suggestions?

[@TheGreekRob]

What jetting are you running? I purchased a vm24 off of Amazon specifically for a ttr125. It’s running a 105 main jet and I’m getting bogging at about 3/4 to full throttle. I’m trying different jets now but the jet kit I got doesn’t fit this Chinese carb.

[@yolo_321_]

Are jet kits available for the knock off carbs, this one in particular?

[@A67auto]

What is a good idle speed for this bike?

[@smokingcongojoe]

And how to modify the Jett s in the VM 24 2 stroke carperator ..

[@kippnovak9833]

Holy shit...a video on KZbin without an ad...wtf

[@shart5619]

if the vacuum cap isn't sealing 100% will that cause it to cut out in the higher rpms?

[@JBAutomotive794]

Possibly so, any air leak around the carbs metering jets will have a very dramatic effect on how it runs. Definitely seal up the carb well.

[@shart5619]

@@JBAutomotive794 I got some vacuum caps but they don’t look like the seal as well as yours. Any tips on how you did yours?

[@JBAutomotive794]

Check at your local auto parts stores. They should sell assortments of different sizes and types of vacuum caps

[@jordanperon7523]

I put a genuine vm24 on my bike it runs great besides when I get into the high rpm it cuts out like what could they be also it's a 2021 model please help

[@alexanderstrobel2889]

How much more horses does it give circa to the ttr? Good video

[@blakemarkin9783]

Ive got a 2008 TTR 125L but on the amazon link, it says only from 2000-2007... Do you think this will still fit a 08 TTR?

[@JBAutomotive794]

The only difference in the later bikes is that they used a double throttle cable setup, this can be easily modified back to a single throttle cable setup however.

[@blakemarkin9783]

@@JBAutomotive794 so my choke cable actually snapped in half about mid way along the cable so hopefully I can just install the new carb, delete the choke cable completely then set up new thottle cable.. WIll I be able to use the same throttle cable or will that need changed as well. Another question is the throttle cable is super tight. There is no play in the twist, how can I loosen that up?

[@ram43x80]

Those ttr come with choke up by the handlebars do we disconnect that n re route it

[@tydavis27]

Great video with vacuum plug info. What size fuel line did you use?

[@JBAutomotive794]

1/4" clear fuel line. I believe the metric size is around 6mm.

[@tydavis27]

@@JBAutomotive794 Thanks....is that ID or OD? Thanks again, your videos are super informative.

[@JBAutomotive794]

Inner diameter. The clear tubing is usually much smaller OD size and will fit better than through areas and bend better than automotive style black hose.

[@tydavis27]

@@JBAutomotive794 Thanks for the info. Do you think capping the vacuum on carb will help with 1st gear sputtering? All other gears pull strong but 1st sputters like it's not getting enough gas

[@JBAutomotive794]

@@tydavis27 it definitely will help. Having a massive vacuum leak will really goof up the fuel/air mixture. Playing around with clip height sometimes is necessary to get it perfect. Also make sure air filter is clean and not causing a restriction.

[@smoknjoe73]

What's the link to buy this carb?

[@MotoG-420]

I got the same bike with the same carb and I just did a top end rebuild and it wont start, did you have to change the jets??

[@JBAutomotive794]

I did not have to change the jetting. Simple needle clip adjustment and the pilot screw and it was in great shape. This bike was actually stolen from me, or else I would make a follow up video.

[@MotoG-420]

@@JBAutomotive794 oh, that sucks, sorry

[@saucy4053]

whenever i bought this carburetor and came around to swapping it for the stock carb, one of the air hoses won’t fit on the carburetor. can anyone help me?

[@ezrakoenigsberg2438]

very good video! Make more!

[@zeleos5865]

I installed mine a couple weeks ago and have been fooling with the air screw trying to fine tune it but it runs rich as well as Boggs and hesitates no matter what I do even after capping the vacuum port. Any suggestions?

[@JBAutomotive794]

Have you tried adjusting the needle clip location up or down?

[@sergiogm4115]

What main jet and pilot jet please?

[@JBAutomotive794]

Unfortunately this motorcycle was stolen from me and I don't have that carb or information anymore. I'm looking to get another TTR soon, it was a super fun pit bike.

[@sergiogm4115]

Thank you!!!

[@blakemarkin9783]

Hey man. I just installed it on my 2008 TTR 125L, I did cap the side vacuum thing. The bike started perfect the first 2 kicks and idled for a while but then died out. Now it will not crank over at all? Any advice? I can send you a video or something to help. PLEASE HELP.. Thank you

[@JBAutomotive794]

Hit me up on Instagram if you still need help @JBAutomarine

[@anansiackhasone3428]

Thanks

[@911bruce]

How did you attach the throttle cable to the slider

[@JBAutomotive794]

It will attach to the slide pretty much the same way that the oem carb slide attaches. Once you remove the cap and spring its slides out and it has a recess and grove it will fit into.

[@goprobros]

Since it's a 2 stroke carb, will I need to mix fuel?

[@JBAutomotive794]

No, the 4 stroke engine has its oil in the crankcase.

[@jordanperon7523]

I just put one on my 2021 and for some reason when you get it in high rpms it cuts in and out but I can tell there is more power to be had any advice?

[@ebutuoycensorship8012]

Buy a honda

[@ebutuoycensorship8012]

Lmao not sure but I know your in the right direction . Maybe upside the jet? Mixture adjustment . Make sure you have no air leak . ..

[@jordanperon7523]

@@ebutuoycensorship8012 I fixed it now it runs great air boot wasn't sealing with the original boot clamp

[@ebutuoycensorship8012]

@@jordanperon7523 sweet handy man

[@mozezcen-valley7555]

Do they sell jets for carburetor

[@jacobjester]

This carb looks different than the one in the description.

[@JBAutomotive794]

Fixed it, they changed the link on me

[@spoon350x]

No links for aftermarket pre jetted carb

[@JBAutomotive794]

amzn.to/2UAdrdc

[@RealMobbin]

What year is it?

[@scutz8747]

Does it come with the vacuum plug

[@JBAutomotive794]

it does not. they can be purchased at any parts store.

[@sniksnak8509]

...and - of course the source for the clone VM jets, especially the pilot jet, as this often on the clones is an "no-no" item to source.

[@trcompton1972]

Hi, would this carb work on a 2016 TTR-125?

[@JBAutomotive794]

I beleive it should work great. Some later bikes use a dual throttle cable setup, so you may have to modify the cable hookup

[@trcompton1972]

Any advice on how to modify , since mine does have the dual throttle cable set up? Thanks

[@JimmyUtahGo]

Current done with factory model. Why rebuild just buy a new one. Good information

[@josehurtado6751]

Where can I buy a vm24 carb?

[@JBAutomotive794]

Check the link in the description, Amazon has them for an affordable price.

[@2shiestyjayy]

Will it work for 2007 model ?

[@JBAutomotive794]

Yes definitely.

[@TommyToboggan611]

All Good info except this carb has an air screw. If the adjustment screw is above the float bowl its an air screw. if its on the btm of the bowl its a fuel screw.

[@JBAutomotive794]

@amfk8079 in this application it performs the same as a fuel screw would

[@TommyToboggan611]

@@JBAutomotive794 no it doesn't, regardless if this was a 2stroke carb to start with, the function does not change when its on a 4 stroke. It is an air screw. You open it to add more air. Take a look at where the passage are routed in the carb. The carb does not know if its on a 2 or 4 stroke. All mikuni VM round slide carbs have air screws as well as there flat side TM counterpart. They have an air screw as

[@JBAutomotive794]

@amfk8079 literally all it does is effect how much air is routed to the emulsion tube for the idle circuit. It controls the idle mixture, and nothing else. Regardless if it's an air or fuel screw, it adjusts the mixture at idle.

[@TommyToboggan611]

@@JBAutomotive794 Right so by your own definition an air screw. A fuel screw would add fuel to the circuit. similar but not the same when tuning. A fuel screw ADDS fuel. means the resulting change is opposite to an air screw. Just pretty easy to get confused much the same way people think pre mix ratio has to do with how lean or rich there 2 strokes are running

[@1chasehayez]

Will this work on a 2019?

[@JBAutomotive794]

I haven't installed it on one that new before. Cannot confirm nor deny

[@highlightzilla9581]

Would it fit a drz 125

[@jalenmarshall6710]

I have a 2009 ttr and I don’t think this carb can fit on this year model.

[@jalenmarshall6710]

I need to know bc I’m ordering one soon mine is cracked lol

[@JBAutomotive794]

I beleive it will fit just fine

[@jalenmarshall6710]

James Bradley Yea I just have to change the throttle cables out because they’re different on 2009 and newer ttrs.

[@sigma7568]

Mikuni vm24 is 28mm??

[@morganmoto8885]

24mm

[@ayl5920]

My TTR back fires

[@jaysonpack679]

I have a van 24 on mine and in 1st and 2nd when I give it gas he keeps getting little spurts of gas and then nothing until I get all the way on it

[@JBAutomotive794]

May want to adjust the needle position and also make sure you don't have any vacuum leaks.

[@michaelglenn2468]

Is there any benefit to getting a genuine VM 24? Or is the knockoff just as good?

[@memztv956]

Knock off carbs never work I’ve had great luck with genuine Mikuni carbs tho.

[@Natedoc808]

You can get proper jetting kits for a genuine mikuni whereas the knockoffs are sketchy at best.

[@againsthell1908]

You'll just hear mixed opinions

[@darenrimando4596]

picked up a 2006 TTR125 L with this carb. It ran like crap. PO had a hose connected to the port you suggested to cap off. So I plugged it. What a difference! Also noticed better throttle response. Now, just need to verify the air / fuel screw for that sweet spot. Seems pretty close though. Thanks for posting this vid!!!

[@taylorious1693]

Don’t. Buy. Clones. Buy a Fucking Mikuni. Anything worth doing is worth doing right

[@ocoutdoors2355]

“It’s the Worst carb ever” Trump

[@JBAutomotive794]

🍻

[@squirmssq3352]

that Brand is junk.........

[@goprobros]

Thanks