How to adjust idle on 4 stroke dirt bikes - fuel screw adjustment
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- Опубликовано: 27 апр 2018
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Vegas RoManiac video: • 2 Stroke WON'T IDLE an...
fuel screw installation: • How to install fuel mi...
2 stroke idle adjustment: • How to adjust idle on ...
This video is about how to adjust idle and fuel screw on 4 stroke dirt bike. This adjustment is very important for smooth idle and crisp throttle response from idle. You need to have correct fuel air mixture to be able to use full potential of your bike, here are few easy step explaining how to tune your carburetor. Take care guys
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4 stroke dirt bike idle adjustment
fuel screw adjustment 4 stroke dirt bike 
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this guy should make videos on every thing he knows because he explains things so thourghly without 1 extraneous fact its literally the best how to video I have ever seen! Thanks for posting!
thanks Patrick, glad you find the video helpful! super encouraging comment bro 👍👍
This his such a good demo that I bookmarked into my tech how to folder, It's well choreographed, clear and concise. Thank you!
thank you, glad it helps!
I’ve been struggling with my bike for a months to make it perfect this helped more than all other videos I watched🙏
never adjusted a carburetor before - watched your video after rebuilding my sons old secondhand carb(after watching another video) , and now it runs PERFECT ! Thank you. Great video.
Thanks for sharing, i am glad it helps! 👍
@@dirtniron I have a 08 KTM 4 stroke I have the needle set at top clip and and fuel screw only 1 turn out and my bike is still running to rich what do I need to adjust to fix this? Thank you for the info
I’m 14 and only have a tiny bit of experience with my dirt bike and couldn’t figure it out. My dad has a lot of experience but none with Honda. Thanks again for helping me out
Now youre 18
@East Coast Lithics and improved his life by switching to Honda. 😂
Thank you very much for taking the time to help everyone! Your an awesome person!!
thanks Michael, appreciate it :)
Thank you for this video mate! It's very clear and easy to understand. Now have a job for my WR450 tomorrow!
Cool Mate, glad it helps!
Thank you so much man, I just bought a yz250f and I thought I got screwed over on Craigslist because the bike was not running the way it should’ve been and a part of me was scared to ride it but this video fixed all of my problems and I just wanted to thank you for this detailed video🙏🏻 definitely subscribing because I’m sure there is even more to learn that could help me out.
cool bro, I am glad it helps! congrats to your purchase, yz250f is great bike!
I can’t think of the right words to describe how much this video helped me so I will just say thank you!
Glad it helped!
Precisely my issue! Got it adjusted and running like a champ. 05 YZ450F. Thanks!
thanks for sharing Clint, I am glad it helped!
Woah, this is what i'm looking for. Thank you!
welcome ;)
Was it making a puff noise when you rev it and try to ride bc mine is doing that them shutting off
@@l3dbeats586 too much air is what it sounds to me
Wow this is a really helpful video, got a 2008 wr250f recent practically brand new. I'll definitely be using these tips when tuning my carb 💯👌🏾
"stay motivated, see you later" only reason I sub. Staying motivated when doing any work my man love it.
Thanks for the sub! Stay motovated my friend ;)
Amazing work! Keep up the good work. The video is very good and informative :)
Thanks man!
I agree totally
@Dirt N Iron thank you so much for making these videos! I have owned my WR450F for only 3 weeks. Having never owned anything with a carburetor I ended up unscrewing the idle screw all the way out. Luckily I was able to take out the carb and re-screw the idle back in. Your videos have really helped me understand the carburetor and how to conduct maintenance on my bike.
glad it helps! have fun with your wr!
Had to subscribe to give a small help, thanks to this video i now know exactly how to properly set my air/fuel screw aswell as the Idle one! Thank you very much!
cool, glad it helps! welcome on board!
@@dirtniron Quick question, when you say in the vid "Turning it out" and the RPM gets lower, on mine it does the opposite, if i'm 3 turns out it's quite high rpm. If i turn it down from 3 turns i get it lower and lower. 2.75 turns seems to be the best for me, right that part where it doesnt get higher, and doesnt get lower.
Should i turn it back a half turn right before it starts to raise the RPM?
So basicly, if i turn it out more, then the RPM rises higher. It's a Keihin FCR 37 (flat) carburetor
Hope i made any sense!
thanks a bunch for making this! just got a 450 ktm smr and your videos have helped me lots to understand the FCR carb!
Glad it helped! thanks Alex!
Great video, he knows his stuff. I adjusted my yz250f just the way he explains. WOW, throttle response is amazing, what a difference from before.
Right on! Glad it helped, thanks for sharing Neil!
Hey could u priv message me where the fuel screw is if it's a stock fuel screw
This video really helped me out thank you! Very easy to follow instructions - thank you sir!!
you got it Ron, I am glad it helped!
Man this video is awesome! Could not have come at a better time. Thanks a lot!
That's cool! I am glad it helps. ;)
Never watched such a simple and informative video top notch stuff man
cool, glad you like it! thanks
Wanted to say thanks for the video brother. I bought a new carburetor and I could not get it running right. I followed what you said , turned the screw all the way in and back it off a little. And it’s now running. Thanks.
Thanks Ryan, glad it was helpful! 👍
Great explanation! I bought a non running yz426f and rebuilt the carb and it back fired like crazy! After taking direction from this video however, my bike is much happier and pulls fat wheelies now !
thanks, glad it helps!
Hahahah just did the same over the last weekend. 😁 Got a non running 426. 😃
Thank you very much for this informative video I have no experience when it comes to bike maintenance I just got my first bike crf450r it wouldn’t idle on its on after watching this video and following these steps I was able to get it up and running correctly it wouldnt keep idle because it needed these adjustments as they weren’t correct and hot start made no difference in the idle which was how I figured out it wasn’t jetted correct and I was able to fix it thanks to you
Right on Giovanni, glad it helps! Have fun on your bike 🤙
This video saved me sooo much time. THANK YOU!!
welcome Bradley! glad it helped
Praise Chapel Romania. Sector 5. Great video my man. God Bless
dude ur videos are so inndept and wheel teached i could watch u all day
Thanks brother, glad you find it helpful! Welcome on board 😉
My family has DRZ 125L that is having trouble idling. We've tried so many things but nothing was working.This video was so helpful!
Thanks for the video, what I was looking for.
cool Robin, glad it helps!
BOOM! Glowing pipe and backfiring sorted! Thanks Rado!
Glad to help!
wooow thanks a lot man my idle was staying high sometimes and I would never have guessed it was the hotstart ! 👍🏻
Right on man I’m glad it helped
Thank you. I've read about this process, but it didn't make sense until I watched this video.
thanks Daniel, glad it helps!
Legend brother...thank you so much. After doing all the free mods. This was key to fix the back firing
right on, glad it helps!
On point I just fixed my bike in like ten min was about to take it to the shop many thanks my guy🤘👍
right on, glad it helped!
Such a great channel, keep up the great work 👍🏻
Thank you! Will do!
Amazing video and it worked and helped me out very well
Cool, glad it helps!
This guy is pretty good. Made it simple for me.
Glad it was helpful. Thanks Pat
Lookin now at others reviews,, wish i saw this years ago!!!!! Thnk you!! Youre like the bike whisperer!!!
Glad it was helpful!
Great video very helpful thank you!
Just the info I was after!! Cheers!
cool James, glad it helps!
Awesome vlog and Intel. Very clear guidance and details.Thanks heaps. Just subscribed. Get it
thanks Brendon, glad you like the video. Welcome aboard!
Perfectly explained! 10/10
Awesome video great explanation!!!!!!
Thank you, very helpful
Very informative, I appreciate the help. I’m trying to tune my carb and this helped a bunch.
Thanks, glad it helps 👍
Dude, this is an awesome video. I am having similar issues that you describe on my sons 2004 Yamaha wr250f. I am going to try all of these adjustments to see if it will clean up. thanks!
hope it helps, if not then maybe you need to try different jets. Good luck!
the video i was looking for , thanks 👍
Glad I could help
I have the same bike with all these issues..... You explained this brilliantly, to the point where i know what i am doing! Lets see if it works though,,, wish me luck!!
Glad it helped, good luck!
Great tip (near the end) on the hot start with little or no response, meaning maybe too lean. That was very helpful in getting a KLX450R carb dialed in with a little more fuel mix. Thanks! (Prior to viewing and tweaking, hot start worked for hot starts, but still backfiring on shifts and trailing throttle.)
Glad it was helpful!
i think this is the 5th time i look at this video. always helps me. thanks
Glad to hear that Anton 👍
Thanks for the great info!
welcome, I am glad it helps
Awesome way to explain and teach other wow perfect
thanks man!
This video was key to getting my 2001 WR250f to start with one kick...
cool man, glad it helps!
Dude, you are awesome !
Glad it helps 👍
needed this! 🙌
glad it helps, thanks!
Great video! Thx for the help!
Thanks man this worked
Super, super useful, thanks!
cool, glad it helps! ;)
Thank you man :) you helped me a lot :)
Glad to hear that!
Thanks for the help!!
welcome, i am glad it helps!
Thx after 4 years i finally got it right
Allot of very helpful info, thanks
Really good vid!!! Thanks
Glad you liked it!
very helpful explanations thankyou!!
Thanks for this!
welcome, hope it helps!
Thank you this helped imstantly ,great video.
Glad to hear it!
excellent information rado
Thanks bro!
great video
Good stuff. Thanks!
you are welcome Neil!
Hi rado, rpm doesn’t stay up when I push hot start ,it raises for two seconds then goes down.
Do you know why??
Thanks
Yehya Rf not really sure, how does it run otherwise?
Great information - thank you
Glad it was helpful!
Will this stew really help or just mess up my carb
Thank you so much your awesome
thank you so much video helped lots
Great job!
Thank you! Cheers!
hey Rado' quick question regarding the " hot start " lever. I removed mine after installing a RSC ( Righteous stunt EZ pull clutch lever which doesn't accommodate this hot start feature as suppose to the OEM ) for my 07' wr450 , number of other guys claim never to have use of it. therefore I removed lever and zip tied cable onto handlebars. however on occasion my bike will all of a sudden cut out and die at stoplight when I take-off . bike takes awhile to restart but finally gets going. could this be affecting the bikes performance ? hope ur doing well man'
Hey Sam, I think that should not cause it. Maybe you are running little lean, so the bike has occasional flameouts. Try to adjust your fuel screw a bit and see if it helps.
Great video, thanks!
Thanks it helped me so much
you are welcome Aaron! Glad it helped
I adjusted mine the way you described and it runs great at idle great throttle response and revs up with hot start but when I go to ride when holding in clutch to stop and down shift it dies any suggestions
Thanks for sharing 👍🏼
No problem 👍
I keep coming back to this for tuning
thanks, glad it helps!
Thanks my bike would not want to start today at all so i just kept turning the screw till it did kick start and then when i finnaly had it running i turned the screw until it sounded just right👌, i have only been riding for 2 weeks now.
cool Vince, glad it helps. take it easy!
Dear sir. Thanks a lot for your explanation. I think now i understand what is going on on my bike
Glad it helps👍
When I screw the air/fuel screw in all the way and bring the idle up, as I bring the air/fuel screw out the revs are going up, not down. Any suggestions? Bike is a 144cc 4 stroke 🤷♂️
Stephen Windle I think you might need to switch you pilot/slow jet to a larger size. That’s what I’m doing to my crf250r. There’s a good video explaining ruclips.net/video/kUw41sUQbTY/видео.html I’ll tell you if it works on mine
100% on the money, before watching this I was left perplexed thinking the worst case scenario. now I know exactly what im listening for and how to dial them in and the bike is 100% on the money cheers for the helpful upload
cool bro, glad it helps!
Thank you SO MUCH! Now I know I need a leaner pilot jet 😆
Glad I could help!
@@dirtniron I just finished my first ever rebuild on a 2004 yfz450, and had no idea what I was doing for most of the build. In depth explanations like this kept me from blowing it up. Thank you!
🔥 Saluteeee
Does aftermarket exhaust cause lean mixture? I have to turned my pilot screw more than 2. I already go 1 size larger slow jet, I think 2 size larger will fix the issue. Is that normal to go 1 or more larger slow jet?
Hey bro I have an electronic start Yamaha 230 do I have to worry about washing it?
go ahead wash the bike, should be fine. Just dont spray high pressure washer directly to bearings and electric parts
I installed a R&D Racing Flex Jet in my Suzuki DRZ-400E and hung it off the metal feul inlet on the carburettor with a zip tie it is the best mod for on the go tuneability especially when going high and low altitudes i highly recommend this product to everybody just do it you won't regret it.
Can you please give me advice on my Tao Tao 125cc four stroke carb change n adjustment
I am sorry I am not familiar with tao tao, but the system should be the same or very similar
You should do a video about float height it's the mostly commom problem on carbs
So what happens if you're fuel screw is all the way screwed in? Will it only idle on choke?
is it highest idle speed or low? im confused
Can you look at a video I uploaded about my dirtbike and the fuel mapping? The bike sometimes dies when I give it too much throttle from idle position.
i saw the video, I am not an expert but i would try first to give her more fuel, it seems too lean specially on the bottom. if it would be carburetor I would suggest to go one size bigger on pilot, try to play with your powercommander and add more fuel.. see how it feels
I have an RPM gauge on my bike and it's recommended I have an idle around 1800 RPM. For this procedure approx how many RPM above 1800 should I aim for to begin? Thanks!
Very helpful.
Ok. I have watched the 2 Stroke (Air Screw vid) and this one. Both awesome and very informative based on the sound and feel of the motor.
My question is. I have a 4 Stroke. Kawasaki KlX 110 that utilizes an AIR Screw. So. Can I set it out 1.5 turns from closed then richen it up to the low rpm state or do i lean to highest rpm?
Don’t want to go from only response. I Like the way you can get close by listening to rpms based off the screw manipulation (opening or closing).
you can go either way and listen to sound, try to throttle response, etc ..
You are awesome ! 😁
;) hope it helps!
Hey Dirt N Iron, i changed the fuel screw on my 2007 yzf250 so i could adjust it when it's warm and hopefully get rid of my decel backfire. But after puting the adjustable mixture screw in, the bike will die if i screw it all the way in, but the rpm doesnt seem to drop no matter how much i unscrew it. With the old screw my hot start reved the bike up now it kills it.
What kind of screw did you buy? Cheap on or brand? Make sure it's installed correctly, oring, washer spring in correct order.