After years of research, your video was most useful. Your test rides were in the same pattern around the house which helped too. So was this a stock Lifan 125? What were your final numbers. 2.0 main jet and 2nd position on the clip? Where did you get your real Mikuni?
I was retuning the jets because I had just done a port and polish job on the head. This bike had a cam port and polish head, high compression piston and a home made big bore exhaust I bought the carburetor from fasterminis.com along with jet kits
Should you adjust the carbuetor (throttle) needle to the last groove? I did that to my 70cc samurai china junk-cross and it went from 20 up to 45-50mph. I didn't feel need to upgrade the carb because the power felt plenty enough for the small frame size. Driver was over 200lbs so that might also tell something about chinese powerhouse. This 125cc should basicly have twice the power as factory setup so I wonder if it goes atleast 65mph. I have heard local boys have got these run 75mph but I don't know what setup. And man these 125cc are still light bikes so the power-weight ratio should be good. I would personally focus on tuning the factory carb right and get some real offroad torque from upgraded sprockets. You just don't drive those forest trails 75mph!!
Yo yo juan wats up man im loving this video its exactly what I needed to see i have a 2018 thumpstar pitbike with a 4 speed manual lifan 125cc i just oorted and polished did a valve lapping etc. anyhow my bike came with the vm26 mikuni also im just waiting for new piston kit to arrive and some other parts my needle clip is set at half in between the other grooves right in the middle im gona check and see what jets i have didn’t even look smh ill get back at you but at hoe many turns should i have my mixture screw set to
@juanmares9817 mikuni recommended no more that 1 1/4 turns. Nice. I did a bunch of mods on this pitbike. Including port and polish the head. High comp. Billet piston and a nasty cam with a custom 2 step diameter exhaust.
I put one of these on my dirtbike and all the guys that got pit bikes I know swear by these but I got a crf100 and they got klx100s and I’m the only one to have the problem but when I am full throttle for like 5 seconds in a high gear it sputter and I came to the conclusion it’s not getting enough gas to the main jet and it made my spark plug look lean but it’s tuned perfect so is there a way I can get more gas to the carb
Yes I got the carb at TBolt. I would junk that carb and spend the money on a genuine carb. Money well spent trust me. More time riding and less time adjusting.
Running a vm26 on a Kawa klx140 stock with a fmf pipe. I’ve gotten rid of most my bog with the quick snap throttle from idle with a 25 pilot but it still hesitates and when snapped to full throttle from mid throttle it completely bogs just disappears. I’m running a 180 main, tried from 140-190 with not much improvement and still running the stock needle 5E75 did you see what needle your using in your carb? Any suggestions?
I like running mine little rich on idle. Bad experience with running too lean. Many many hours of use and still no problems. Still requires choke on cold days...
I have a rxf 150 freeride is has a pz26 carb on it I put a uni sage 2 air filter on it and it Boggs when I ride it or when I snap the throttle but idles great. Think you could help?
Hey man i have a 2014 apollo and i got a mikuni vm26-606 and i can’t find the correct intake neck and gasket to mount it can you link it or make a video and I also have another problem with it i can’t figure to take it off so can you make a video on that?
Yes sir no problem. On the current intake manifold you have what is the mount hole distance center to center? Then I can give you the link on correct intake boot to order
@@juansprojects3056 it is a 1 5/8 inch and i figured out how to get the throttle cable out i left the slide aping in so it was pushing pressure on the plate holding it in
@@pactube61 ok so 1 5/8 would be about 41.2mm does your intake manifold look like mine in the video or is it more angled up and curved? I have a Instagram it's called @pitbike_fetish you can send me pictures there or videos so I can see what's you need more clearly.
Have you tried playing with different size jets and/or moving the needle up or down with any result? I always trash the Chinese carbs and get a name brand one
Measure the distance between the carburetor mounting bolts, usually 2 (8 or 10mm) bolts sometimes have problems with the throttle cable being too long or short but what ever problems you come across there is a solution.
Always just change out pilot jet engine idels off the pilot jet only. until you get it to idle good then you can mess with the main jet, and needle IMO. Pilot jet = 0-1/4 throttle Needle =1/4- maybe little over half throttle Main jet = little over half throttle - wide open throttle
I would assume it is as the vm26 is for a 140cc starting think he got the name wrong not 100 percent tho I'm gunna get same one u have to get a quad running better hopefully
Some cylinder heads have big intake valve typically don't want a carb that's bigger then the diameter of your intake valve. Other cylinder heads have smaller intake valves. Size accordingly....
so you let it warm up then turn the mixture screw until it idles as high as it can then turn the idle screw down til it idle where it supposed to is this the tuning process? and its a 30mm carb too big for 125cc?
That's how I tune the the pilot jet. The screw adjustment is only for idling and off idle (up to quarter throttle) Mikuni only wants a max of 1.5 turns from fully seated screw. 30mm may be too big but you could make it work. Rule of thumb is don't go bigger than the size of the intake valve you have in your engine. My intake valve is 27mm so I went with a 26mm mikuni
Brother I just installed this and my idle is CRAZY HIGH when the choke is pulled out. Hav you had this problem? Do I need new jets or what!? I know these don’t come tuned. I have a 125cc pit bike. How can I bring the idle down it’s fucking crazy and the throttle stew isn’t doing much
I had the same problem. The throttle cable was not long enough so I had to remove a few milimeters of the hull. Take a look inside the carb when the throttle cable is installed. If the carb is not closed even when not turning the throttle, your cable or rather the hull is too long which results in a short throttle cable. It is kind of a pain to do but works. The hull consists of a layer of plastic then some steel 'coil' I guess you could call it that and then some more plastic. Do not damage the inner cable while doing this.
@@shintokatana17 I was beginning to think that my throttle cable is too short because I replaced it with a brand-new one but wondering if it’s just not long enough, when I look inside the carb it’s almost wide-open as if it’s being pulled up before I even touch the throttle itself. That makes a lot of sense, I wish I was more experienced with this stuff
I cut mine and ran it down to the bottom of the bike there was actually a little clip there to hold it already. Didn't notice my bike running any better or worse after I did it though.
@Eric Stewart there's already a filter on mine. I left that on, sorry I should have said that. I don't think anything is being sucked through that hose either way though. It's a vent hose not a vacuum hose. Let me know if I'm wrong.
I’m new to carbs thanks for all your knowledge
I feel like I was there with you.
Nibbi
thanks 🙏 your video has been a huge tool. very grateful
Running good, thanks for the video, and thanks for the great ride, looks like a nice farm ranch, enjoy it , as you are.
(I am rebuilding a vm Mikuni)
For Folks, I have a 1.210" inside carb bore facing cylinder, x 25.4 mm/" =30 or 31 mm throat. Application 1987 quadrunner 250.
Mikuni.
VM style.
Nice 1 mate, I'm planning on doing my carb soon so this is handy information 👍
Thanks man, this carb is perfect much more responsive.
@@juansprojects3056 is the air filter 1/2' or 3/4'
I’m about to go through this same process. I just ordered a lifan 125 next will be the same carb you have
That was a cool video 👍🏼 thanks
After years of research, your video was most useful. Your test rides were in the same pattern around the house which helped too. So was this a stock Lifan 125? What were your final numbers. 2.0 main jet and 2nd position on the clip? Where did you get your real Mikuni?
I was retuning the jets because I had just done a port and polish job on the head. This bike had a cam port and polish head, high compression piston and a home made big bore exhaust I bought the carburetor from fasterminis.com along with jet kits
@@juansprojects3056 Dang $115 well I guess that’s my fault for searching up the best carburetor for ssr 125 pit bike, wait doesn’t even work on that?
Good video sir 🤙🏼
Should you adjust the carbuetor (throttle) needle to the last groove? I did that to my 70cc samurai china junk-cross and it went from 20 up to 45-50mph. I didn't feel need to upgrade the carb because the power felt plenty enough for the small frame size. Driver was over 200lbs so that might also tell something about chinese powerhouse. This 125cc should basicly have twice the power as factory setup so I wonder if it goes atleast 65mph. I have heard local boys have got these run 75mph but I don't know what setup. And man these 125cc are still light bikes so the power-weight ratio should be good. I would personally focus on tuning the factory carb right and get some real offroad torque from upgraded sprockets. You just don't drive those forest trails 75mph!!
Yo yo juan wats up man im loving this video its exactly what I needed to see i have a 2018 thumpstar pitbike with a 4 speed manual lifan 125cc i just oorted and polished did a valve lapping etc. anyhow my bike came with the vm26 mikuni also im just waiting for new piston kit to arrive and some other parts my needle clip is set at half in between the other grooves right in the middle im gona check and see what jets i have didn’t even look smh ill get back at you but at hoe many turns should i have my mixture screw set to
@juanmares9817 mikuni recommended no more that 1 1/4 turns. Nice. I did a bunch of mods on this pitbike. Including port and polish the head. High comp. Billet piston and a nasty cam with a custom 2 step diameter exhaust.
@@juansprojects3056 wow thats awesome where can i purchase the billet piston and the cam?
@@juansprojects3056 gm. Juan we got same names lol any how my jets are. 190,25 and the long tube where the long needle goes through is 332 0-0
I put one of these on my dirtbike and all the guys that got pit bikes I know swear by these but I got a crf100 and they got klx100s and I’m the only one to have the problem but when I am full throttle for like 5 seconds in a high gear it sputter and I came to the conclusion it’s not getting enough gas to the main jet and it made my spark plug look lean but it’s tuned perfect so is there a way I can get more gas to the carb
I have a 110 and trying to up it a like like to get a new carb.
Nice job !… what intake or adapter boot did you use to run this carb?
Can’t figure out the throttle cable. Needle seems to be too long… any ideas on what I’m doing wrong? Keep hearing it transfers right over
I'm running a 160main on a 140cc.
can you put a link where you bought the carb
Sounds like a honda now...where did u get that carb. TBOLT? I have a thunpstar tsb125 with a chikuni vm22. It runs like poop unless wide open
Yes I got the carb at TBolt. I would junk that carb and spend the money on a genuine carb. Money well spent trust me. More time riding and less time adjusting.
Running a vm26 on a Kawa klx140 stock with a fmf pipe. I’ve gotten rid of most my bog with the quick snap throttle from idle with a 25 pilot but it still hesitates and when snapped to full throttle from mid throttle it completely bogs just disappears. I’m running a 180 main, tried from 140-190 with not much improvement and still running the stock needle 5E75 did you see what needle your using in your carb? Any suggestions?
Eid you find a solution ? Its also dying on me when i snap the throttle
Wish you showed the installation on it man I’m lost af.
What are you having problems with?
Great video! Just received the same carb. Gonna install it this weekend. What did u do with the old air intake tube ?
Sorry for late reply. How did the carburetor work out for you? Did you run into any issues?
Nice video but if it will start cold without the choke it’s too rich and is bad for the engine
I like running mine little rich on idle. Bad experience with running too lean. Many many hours of use and still no problems. Still requires choke on cold days...
I am riding a stock lifan 125 so a vm22 will be much better.
For a 110 Apollo what carb mikuni should I grab? 22mm ?
hello good video. can you put the link of the jets?
Yes sir my apologies I just updated the description should have links for the main jet and pilot jet kits now
U went 200mj, what size piloted, & what clip-setting on jetneddle?
Hey dude, will this carb work on my Chinese 250 Enduro?
155zs with vm26 all jetted is the one dont quite know why you messing with the 125s i find them super slow compared to the Z155s+
All I could afford at that time. I was trying to maximize what I had. My next build is a 190 with a different bike. video coming soon!
I have a rxf 150 freeride is has a pz26 carb on it I put a uni sage 2 air filter on it and it Boggs when I ride it or when I snap the throttle but idles great. Think you could help?
When does the bog happen? Soon as you turn the throttle? or more like 25% throttle
Did you oil your filter?
Hey man i have a 2014 apollo and i got a mikuni vm26-606 and i can’t find the correct intake neck and gasket to mount it can you link it or make a video and I also have another problem with it i can’t figure to take it off so can you make a video on that?
Yes sir no problem. On the current intake manifold you have what is the mount hole distance center to center? Then I can give you the link on correct intake boot to order
@@juansprojects3056 it is a 1 5/8 inch and i figured out how to get the throttle cable out i left the slide aping in so it was pushing pressure on the plate holding it in
@@juansprojects3056 to be specific it’s 1 5/8 from by hole to bolt hole and the mount has like a dip down like it’s not a complete oval
@@pactube61 ok so 1 5/8 would be about 41.2mm does your intake manifold look like mine in the video or is it more angled up and curved? I have a Instagram it's called @pitbike_fetish you can send me pictures there or videos so I can see what's you need more clearly.
@@juansprojects3056 I will do you on instagram it will be easier there
yall i need help i have he same bike i have av ssr125tr and it wont start but you can some times smell the gas being burned when you kick it
May be getting to much gas.
I just bought a stomp 160 and I feel like my bike doesn’t have power at low revs when the revs pick up it’s fine would a good carb solve this? Cheers
Have you tried playing with different size jets and/or moving the needle up or down with any result? I always trash the Chinese carbs and get a name brand one
Anyone know the fittings for these on a 125cc, I have no idea what I’m looking for and don’t wanna buy it if and it not fit my bike.
Measure the distance between the carburetor mounting bolts, usually 2 (8 or 10mm) bolts sometimes have problems with the throttle cable being too long or short but what ever problems you come across there is a solution.
@@juansprojects3056 legend
So from what I take you're running a 17.5 pilot and 200 main?
I'm having a hell of a time tuning my VM26 on the 13 crf110 132 big bore
Always just change out pilot jet engine idels off the pilot jet only.
until you get it to idle good then you can mess with the main jet, and needle IMO.
Pilot jet = 0-1/4 throttle
Needle =1/4- maybe little over half throttle
Main jet = little over half throttle - wide open throttle
I ended up running 25 pilot jet.
When you moved the clip did you move it up or down?
I moved the clip down a notch in the needle so it sits higher to get more fuel from quarter throttle to three quarter throttle.
@@juansprojects3056 okay that’s what I thought but wasn’t sure. I think I need to do the same on my bike
It's worth a shot. Only takes a few minutes and you may like the results...
My carb boggs soon after 25% throttle... What could it be...
Needle adjustment is needed. You have no issues at full throttle though?
Look at video from 3:30-4:00 minutes
@@juansprojects3056 when i rip open the throttle it boggs, at low rpm it is fine
@@Wannabeanangel7 try moving clip on needle a few places up or down and see what that does.
i have a rfz x18 125cc and replacing my carb with a mikuni i bought a vm22 26m is this not the right one ?
I would assume it is as the vm26 is for a 140cc starting think he got the name wrong not 100 percent tho I'm gunna get same one u have to get a quad running better hopefully
I have heard 26mm is to big for 125. How does yours run ?
Some cylinder heads have big intake valve typically don't want a carb that's bigger then the diameter of your intake valve. Other cylinder heads have smaller intake valves. Size accordingly....
so you let it warm up then turn the mixture screw until it idles as high as it can then turn the idle screw down til it idle where it supposed to is this the tuning process? and its a 30mm carb too big for 125cc?
That's how I tune the the pilot jet. The screw adjustment is only for idling and off idle (up to quarter throttle)
Mikuni only wants a max of 1.5 turns from fully seated screw.
30mm may be too big but you could make it work.
Rule of thumb is don't go bigger than the size of the intake valve you have in your engine.
My intake valve is 27mm so I went with a 26mm mikuni
@@juansprojects3056 ok you confused me. according to amazon the vm22 is the 26mm and the vm26 is the 30mm. i have the vm22 and i know its 26mm
@@warrenpeas on the engine side of the carb inside diameter is 26mm
Will this automatically fit onto my yx140 stomp?
I don't see why it wouldn't fit. Might have to buy the boot as well for the carb.
Got the boots and that mate but for some reason it the boots just ain't sitting in properly
Please help
@@juansprojects3056 possible you do a installation video?
@@ttid7298 if you have a Instagram look up my page @ pitbike_fetish there you can send me pictures of what's going on so I can try to help you out.
Can you put a 160cc or 190cc carb on a 125cc?
You could, but that may do more harm than good performance wise
Brother I just installed this and my idle is CRAZY HIGH when the choke is pulled out. Hav you had this problem? Do I need new jets or what!? I know these don’t come tuned. I have a 125cc pit bike. How can I bring the idle down it’s fucking crazy and the throttle stew isn’t doing much
Check for vacuum leaks.
Make sure the throttle cable is long enough and the round slide the throttle cable connects to is all the way down
I had the same problem.
The throttle cable was not long enough so I had to remove a few milimeters of the hull.
Take a look inside the carb when the throttle cable is installed.
If the carb is not closed even when not turning the throttle, your cable or rather the hull is too long which results in a short throttle cable.
It is kind of a pain to do but works.
The hull consists of a layer of plastic then some steel 'coil' I guess you could call it that and then some more plastic.
Do not damage the inner cable while doing this.
@@shintokatana17 I was beginning to think that my throttle cable is too short because I replaced it with a brand-new one but wondering if it’s just not long enough, when I look inside the carb it’s almost wide-open as if it’s being pulled up before I even touch the throttle itself. That makes a lot of sense, I wish I was more experienced with this stuff
What did you do with variator case hose?
I cut mine and ran it down to the bottom of the bike there was actually a little clip there to hold it already. Didn't notice my bike running any better or worse after I did it though.
@@Maniakk44 I needs a filter or ur crank case will suck up dirt
@Eric Stewart there's already a filter on mine. I left that on, sorry I should have said that. I don't think anything is being sucked through that hose either way though. It's a vent hose not a vacuum hose. Let me know if I'm wrong.
Grate vid bro, the vm 26 is the model 606?
Yes sir. Model 606!
Thank you, i think i will buy that carb, but is working with 200 maximum jet? Is a lot but the engine work great, thank man
@MrCazzochepalle jet size will depend on outside temperature,elevation, and mods done to engine..
Of course, thanks a lot, i will try to make work good my yx 125
Nibbi way better