Checkout more *How-To* guides here! → goo.gl/EwdtM4

@SDsailor7

3 жыл бұрын

My bike idles ok but when i apply the rear brake it dies. I should mention that it has two screws one for the idle and one for the air/fuel mixture. By the way it is a 80 Indian moped with a keihin pa moa carburator. Thank you

@Fixyourdirtbike

3 жыл бұрын

@@SDsailor7 When you hit the brake, or come to a stop in general?

@SDsailor7

3 жыл бұрын

@@Fixyourdirtbike I have not driven it yet i just recently completed the restoration i started it and adjusted the carburator and that is it. When i apply the brakes is when it dies. I was told that i need to do a compression check to see if the rings are ok. Right now i dont have the right adapter to do the compression check. If i remember right the manual says to adjust the idle until the rear tire stops turning but if i do that it dies so i had to raise the idle. So i am not sure if i am doing the carb adjustment correct or there is a problem with compression and it can't handle a load.

@nadinderlic3047

3 жыл бұрын

Hello , can you help me with adjustment this carburator on Yamaha DT 125, I screw and unscrew it and now not have power at start , I must add throttle more times to get power

@sowersass2

2 жыл бұрын

I really hope i get an answer, So my carb does have the idle adjustment knob and ive changed it. How do i reset it to a neutral position? Just twist it all the way in? but that would probably take the idle down way too much. or take it off and then do it? Ive got it better than before but the idle still is a little bit off. Idk if im making sens haha but I Hope someone can help, thanks. Oh i almost forgot I have a 96 rm250, its in good shape for the most part.

This was the most time - efficient video i have seen in my life.

@SimplyMage19

3 жыл бұрын

Besides the unskippable add at the start lol

@gushamilton5188

2 жыл бұрын

It was perfect.

@tothepoint4240

Жыл бұрын

Hell ya

@ChezArtet

Жыл бұрын

@@SimplyMage19 get KZread red if u don’t want adds

@harambewilliams564

5 ай бұрын

I was Going to say that same thing

Quick and to the point with no BS, I like it!

there are very view tutorials on the web that get such a good point out so fast .a screw driver,a strong leg,and patience,could not have said it better myself.

I'm 4 years late but, thank you. Made my life way easier. I was adjusting the choke idle knob haha.

@accipiternisus649

2 жыл бұрын

Me too

Wow, I was ONLY adjusting the fuel mixture because I didn't know there was a pilot air screw. So my bike would fire right up but die over time because I was flooding it. It was eating gas and throwing fuel onto the exhaust. Thanks a lot.

Fantastic video. 1 minute 47 seconds and all the information I needed. Keep up the good work!

Awesome video. Easiest to follow and very very informative. I thank people like you that make it easy .

They say the more simple an explanation, the more understood the subject is. This was so quick and to the point, THANK YOU!!!

Very helpful video. My scooter in freezing temperature was reaching easily 70kmh and with a warmer weather slowing down and I had to be satisfied with 45kmh. Now at least I understood why... Thank you very much!

Bravo! this is a master class on how to make a quick and informative video. Bike is idling like a champ now.

NAILED IT!! No fluff and all resolve.. KILLER!!!

Thank you for the quick tutorial!! My IT175 was idling super high and this did the trick. Took less than 5 minutes to adjust it properly. Thank you!!!

@Fixyourdirtbike

4 жыл бұрын

Glad to help!

WOW ONE OF THE BEST HELPFUL VIDEO ON YOU TUBE .. NO SHIT TALKING JUST STRAIGHT TO THE POINT AND FINISH ... WHAT I NEEDED TO KNOW ... GOOD ON YOU MATE !

Just got my fist 2 stroke and im new to the jetting carburetors. Thanks this vid helped alot

Concise, precise and straight to the point. Gotta love it.

Helped me start my bike after a top end rebuild 🙏🏼 thank you!

wow thank you. simple, precise great angle on the work. well done

Thank you so much for this video, on our RM85/L there is no idle tune like there is on the 125, I didn't know where to adjust the idle because it would just bog out and die after 3 seconds. I will definitely use this to help tune my bike. Thanks so much!

@Fixyourdirtbike

7 жыл бұрын

Thomas Harp Glad to help!

nice vid man.now i can easily start my scooter after watching your video i feel like im the king of the world.lol more vid to come

This video just solved all my issues in 2 minutes. Thank you

7yrs but i used ur video as guide thank you

Hey man, I appreciate the video I’m 14 and I have to do everything myself and this is my first time ever doing this and I did it first try thank you

Thank you so much. Rebuilt my cr 125 couldn't figure out how to fix the idle cuz it idled at almost the rev limiter knew it was carb related thanks to the video I know how to fix it

@Fixyourdirtbike

6 жыл бұрын

Cam Ben Glad I could help!

Exactly what I needed to hear and nothing else, thank you!

Thank you so much lol just bought my first 2 stroke bike 1999 cr250 (has this same carb) and couldn’t figure out why it wasn’t running right, turns out I had my af screw turned all the way in

What a great video! I clean lots of carbs and the way you presented the info is so clean and tight including the text in extra large print.

@Fixyourdirtbike

7 жыл бұрын

Glad you like it!

This video was so informative and straight forward that I felt stupid for not understanding carburetors beforehand!

@Fixyourdirtbike

6 жыл бұрын

HAHA, thanks for watching!

Hey bud love the videos!! My YZ250 runs nice and crisp when it's cold out but as the weather gets warmer (Las Vegas Nevada) it's not as crisp anymore. I don't want to mess it up so i haven't tinkered with it but your video helps. I think it's running rich right now.

@Fixyourdirtbike

2 жыл бұрын

Thanks for watching! Yes, if your bike is crisp in the cold, but sluggish in the heat, you have a rich condition when it warms up. How drastic are the temp changes in Las Vegas?

I have a 99 cr 250 and your videos have help so much thanks very much.

@Fixyourdirtbike

5 жыл бұрын

Glad to hear!

@brucebfd

3 жыл бұрын

Me too.. super amount of help!! And my 1999 cr250 is doing much better..

This video help me a lot!!! Thanks

I am 5 years late but THANK YOU SO MUCH. I will try this as soon as I can!!!

All I needed to know thanks man

Thank you carburetor man very informative very professional very well done😊

@Fixyourdirtbike

2 ай бұрын

Thank you KZread viewer. 😀

Great answered my questions thanks!

8 years later and this video is still the best.

Solid video i will try this on my bike tomorrow

@Fixyourdirtbike

3 жыл бұрын

Good luck!

Excellent video, subbed !

Thanks for the video i built a 2 stroke again its been long enough to almost forget the air leaks and mostly the simple things 😂😅

This help me in like 2 seconds thank you

@Fixyourdirtbike

4 жыл бұрын

Glad to help!

Thank you helped me alot

Hey there thanks for the video, i hope u can help me out , i just got a ktm exc-r 450 and i want to know what does the idle helps in exactly? and what the best thing to do? also am facing an issue when i turn the throttle to speed up sometimes i feel like the bike doesn't respond well as it feels like its about to die or its like its out of gaz then it speeds up?

thank you

Thanks bro

Thanks and Well done

Thanks for the help 👍

@Fixyourdirtbike

2 жыл бұрын

Happy to help

Can you do a video for how to fix the choke on Honda CR 250cc.

Bro u fixxed my stupid gas gas 250 it was 4 stroking bad and bi mechanic was able to fix it had to to down from a 180 to 160 and main jet was a 50 and went to a 45 bc it kept fouling plugs also 1-2 gear would feel like hitting rev limiter thank you so much

I have a TM 300 with the usual PWK 38. The bike starts at the first kick, cold or warm, but it tends to stall and the air screw does nothing... I thought I had a leaky jet block gasket but after a leak test, found out it's good. 42 idle jet. 175 main. The bike runs OK, the only problem is this rough idle, the tendency to stall (dangerous, expecially when going downhill on very slow/hard situations) and the air screw doesn't affect it. The carb is clean.

Best ever, beats the hell out of the 20 min junk.

Great video! Bike won’t idle any recommends on where to buy the stock keys including the slow jet?

I got a keihin pwk 28 carb that has been modified by the previous owner... he took the choke off and filled the choke passages with jb weld so basically carb has no choke is that bad or a good thing??

On a PWK35 there’s an air adjust screw and a throttle stop screw. The throttle stop screw is pretty straight forward but some input on the air adjust screw would be appreciated.

@Fixyourdirtbike

5 жыл бұрын

The throttle stop screw is for on the fly adjustment, and the air screw is for adjusting the base tune of the idle. Checkout my tuning guide for more info → www.fixyourdirtbike.com/fix/how-to/2-stroke-carb-tuning/

Thank you for the video. I have a Keihin 38 PWK and the air mixture screw has to turn almost all the way out in and the idle adjustment screw has to turn almost %70 in in order to have a smooth idle. I put pilot Jet 45 on it (the stock size is 48) and no improvement. What would you suggest? I appreciate your help. Ejmin

My motorcycle stock at 9 years and when it cleaned the carb only it start but I can't reach 60kmh cause of "bogging" or anything and they said it's too old so that can't run , I hope this work hehe.. : Thank you for fast guiding♥️

@Fixyourdirtbike

4 жыл бұрын

It sounds like a vacuum leak. Check your carb body for cracks and recheck all the seals.

How do you reset the idle knob? Do you just close it all the way or the same as you did to the air screw?

Since I bought the engine kit I’ve never touched or took apart the carb the only thing I have the touched is the set screw with spring

Thanks for the great information I have a scooter if i but the fiter in place it wont go faster because it nees more air to go in what the cause of that... And the curb dont have a air screw but the thing i know it have a big jet hole...

@Fixyourdirtbike

6 жыл бұрын

The ratio is correct with the air filter on. So the engine gets enough oxygen and fuel to work right.

Hello, I enjoyed watching it, but I have a Kawasaki KX100 bike. There is no change when moving the air adjustment screw, knowing that in the past the adjustment changes. What are the possible reasons?

Can i use the guide with my 4t engine ,i use same carb with the one in video

Hello I've been watching your video trying to tune a 96 ds80 just put this in the rings in bike is running and runs good but dies after 10 15 minutes have gone through the car and adjusted the flow also clean the car but it was very clean do you have any ideas that I may try?

does anyone know where to adjust the float level on keihin pj28L is it like adjusting any other float, from the base of the carb to the top of the float or is it different?

Helpful

Love the video...so I have a 1978 Suzuki 125ts with mikuni vm24 carb. One main screw on right side middle, one small screw on left side closer to air filter...I have done every adjustment possible, it will idle until I ride it and try to coast or downshift then it dies...any suggestions

@Fixyourdirtbike

4 жыл бұрын

Thanks! The bigger screw on the right side is the throttle stop screw, so the more you screw that in, the higher the throttle slide will sit when closed. The small screw on the left is your air screw which affects the air/fuel mix at idle. First things first; when did you clean your carb last?

Good stuff !! very informative and understandable. I just bought a cr250 i just got home with it. i know for a fact its going to need to be re jetted so im still in the process of researching 2 stroke jet options. im new to two strokes so im going to learn as much as i can. The main thing is the bike was residing at sea level, where i live is 4500 ft above sea level. So im not even going to bother trying to ride it yet. Do you have any personal sites or calulators you use to choose a proper jet for your bike ? so far the jetting i've seen is just what exhaust manufacturers recommend for their systems. But i guess im looking for a more idiot proof list that simply says what size jet is required for x-elevation and so forth.

@Fixyourdirtbike

6 жыл бұрын

The nice part about these older bikes is the carb jetting is very forgiving. It will probably run at 4500ft. I'd clean the carb and take it for a ride, see what it does. Make sure to checkout my tuning guide bit.ly/2Strokeidle to get your bike where it needs to be!

I need help I have a kx 100 2014 and I need to know if the altitude is low what do I do and if the altitude is high what do I need to do to the air screw

I bought a lectron carb hav any insite on that? The bike starts almost always first kick but I have to turn the choke on to get is started. But turn it off fairly quickly otherwise the bike will die.

I have a 2001 kx250 I just recently rebuilt I bought all new jets for the carb stock ones with the idle screw turned all the way in it still doesn't idle I've messed around with the air screw multiple times all the way in all the way out and evedythjng in-between still nothin what do you think it could be

93 yz not starting. i guess i should go with the stock yamaha carburetor settings, would yo agree?

Does this work for a 04 Yamaha blaster 200?

Hey mate I have yz250 04 with a 300 Athena kit on it I can’t seem to get the idle right. the airfuel screws 2 1/2 t out

I followed your instructions and my bike still doesn't start but it gets so close but still doesn't. do you think I need new jets?

solid

What does he mean by placing the adjustment choke knob to a nuetral position? Do you mean half way? I have both Clymer and Honda repair manuals and both books do not have a direct answer for this on the cr125. I have read 7 clicks out and/or 30 clicks out but 30 clicks and that is with the choke fully on so there is a lot of conflicting information.

I got a 98 Yz80, and sometimes when I give it full throttle it will bog, usually in the higher gears, 4-6, it idles great, and usually when I start it, I don't have to use the choke, even when cold. I'm running 50:1

@Fixyourdirtbike

7 жыл бұрын

You are definitely running too rich. Try reducing the size of your main jet first, that should take care of your bogging. I would reduce the size of your slow jet too, if you can start cold with no choke it's too rich.

The idle adjustment know on the choke, how do u reset it back to neutral position? Or how many turns clockwise or counterclockwise?

@331moto

2 жыл бұрын

Yeah I want to know the same thing...

My kx125 revs pretty high on idle and when I rev it, it revs up good but will be idling a little higher than it was before. If I rev it up high, it idles extremely high too

@Fixyourdirtbike

6 жыл бұрын

It sounds like your slide or throttle cable is sticking

What about the screw with a nut locking it in just above the “idle screw”. Seems like I’ll set it perfect with easy starts, and good low idle but after riding for hour or two it bogs down and will not start. I usually find the cylinder is wet and excessive fuel on the plug. However if I turn the screw out (or in) it will either fail to start or will not idle. I have a jetting kit with several jetting sizes. If I go down it will not run unless idle screw almost all the way turned in, if I go up in size it’s almost all the way screwed out with 3/8s of thread showing. I’ve changed the screw above the idle in all this with no luck

How do you place the idle control knob in a neutral position ?

Short and simple

I'm saving this video just in case my dumbass forgets lmao

Is it the same with fuel screws?

I need help with my 92 ktm 300exc. I tried to adjust the idle adjustment on the cold start button now my bike wont stay running. So I took the whole knob out because either way I turned it it wouldnt fix it. I dont know how many turns I should have it at when I put the cold start button back in the carb.

Hi nice video. I’ve a Honda CR 125 1997 and does not keep idle. After I watched the video I tried to play with the air pilot screw as you recommended but does not keep idle my bike. However if I turn the air knob it does and can keep idle. In your video you said that the air knob should not be used for adjustment but is written right below the knob on the carburetor “idle adjustment” with indication to turn it left right. So what do you recommend to do replacing slow jet? Can you help me to understand where the slow jet is located and which size should I find for replacement? Thank you very much for your help.

@Fixyourdirtbike

5 жыл бұрын

The knob is for one the fly idle adjustment, not tuning. Put your idle knob in the neutral position and try to adjust the idle with the idle air screw again. You may need to just clean the carb. Unless you are riding at extreme altitudes or you have a lot of work done to your engine, the stock jetting will almost always work. Let me know how it goes!

What carb is that my friend needs slow jet and has same carb on 1992 cr125

Do you know if on a keihin carb.how maen turns in on the idle speed screw. From the time it touches the slide.

@Fixyourdirtbike

4 жыл бұрын

It's for idle speed, so whatever works for your tune.

Hi! My bike starts, goes ok on idle (maybe a lil too high) but when i give throttle the gas hangs for a bit and slowly goes down, I dont think i have it too lean. Anything i can do to fix??

I have a pw80 and i need to know how to adjust it

Quick question on my cr 85 I have to high rev my bike before letting out the clutch or it'll turn off does that mean I need to tune my carb?if I let out the clutch normally it'll just bog

@Fixyourdirtbike

7 жыл бұрын

Your slow jet may be clogged

Hi, thanks for all your videos. Would you believe my air adj screw is totally seized. My carb is a 38 PWK Shorty off a 2007 exc. I will need to drill it out. Unbelievable !

@Fixyourdirtbike

4 жыл бұрын

Wow, that's a new one for me!

Hey quick question I have CR250R she idles when air screw is all the way out but don’t when the air screw is closed ? Would you reckon I need a new smaller jet? Thank you

@Fixyourdirtbike

3 жыл бұрын

I would check your float level and float valve seat first. If those are OK, then you would need a smaller slow jet.

Question, when you try to start your bike the first time with the screw halfway out, are you using choke and is the engine cold?

@Fixyourdirtbike

3 жыл бұрын

The engine should be warm when tuning. I should have put that in there, and I have plans to redo this video.

Also dose the throttle stop screw serve the same purpose as the idle adjustment knob?

@Fixyourdirtbike

6 жыл бұрын

The throttle stop screw should be adjusted after you get your low idle set. The throttle stop screw does not change the mix in the idle system, because it holds open the throttle plate, which engages the main jet system. I'll set my throttle stop (if I'm on a bike that has one) when riding in difficult conditions like big rocks or technical hill climbs to make the throttle a little more responsive. Another benefit is it's easier to keep your bike alive when you get stuck/crash.

hey I have an yamaha rx 135, I just want to know that during tuning my carburetor to increase my initial pickup to the top-end how many turns of the Av jet should I have to take

@md7291

7 жыл бұрын

is it 3 half cycle or less then that, because I want a high performance in 1 st gear

Great video. My son has Suzuki jr 80. We just had the carb worked on and it's running great, but he now has a hard time starting it. He's 9 and weighs 65 lbs and has a hard time kicking it hard enough to get it started. I can start it pretty easy when I choke it and kick it over, but he struggles where it used to be really easy for him. After it's warmed up he can start it fine. Would this be an air adjustment?

@Fixyourdirtbike

6 жыл бұрын

If the temperature increased significantly where you ride your carb is now running rich. Play with the air screw and see what happens. You may need to re-jet a size smaller on both slow and main.

If it’s getting too much oil how do I fix that I like

my plugs are wet and dark. what should I try first?

@panagoskakatosis5314

3 жыл бұрын

take air screw out 1 turn or more

thank you for video,I have problem with carburetor,when engine is cold I close completely choke shutter and engine work idle,but after warming when I open choke shutter engine works high,max rpm and after few seconds engine falls !! can you solve this problem please?

@Fixyourdirtbike

6 жыл бұрын

It sounds like your jetting is too lean and too much air is getting through. When you are choked your engine is getting the right ratio so it runs right, then when it opens the sudden increase in oxygen causes the engine to take off. I would start with a larger slow jet.

I already figured it out the piston had blow bye and it was shooting oil out

what's up man just built a water-cooled motor.motor runs and idle but when I throttle it bogs but if I run choke up it response like how it should be if it's down. running a 33 Keihin carb main-142 pilot-52 needle clip one up from the middle. but question is way does it bog? I'm assuming it's my pilot to small??? I'm like 2 & 1/2 turn out on pilot screw from the body.lmk thanks

@Fixyourdirtbike

6 жыл бұрын

Is you engine cold or warmed up when that happens?