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How to Get Your 2 stroke Idle Perfect! YZ125
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- เผยแพร่เมื่อ 3 ส.ค. 2012
- How to fix your 2 stroke idle to get it sounding a running perfect. I had problems with my idle on my 2005 yz125 but after 2 weeks of dealing with it I finally figured out how to fix it!
DONT CLICK THIS: bit.ly/2JfFyZg
Adjust the air fuel screw until you get the highest idle. Should be between 1 and 3 turns out from all the way in. Then ride it and adjust the screw in 1/8 increments until you get the best throttle response. Then set the idle speed screw. If the air screw is best less than 1 turn out you need a richer pilot jet. If best over 3 turns out you need a leaner pilot. After you set this then you can check your needle and main. Cheers
2 1/4 turns out is the best for the mikuni carb on my yz125
so with a open end wrench hold the nut and turn the screw all the way in(right). once snug loosen/turn(left) 2 1/4 turns. what if my screw wont turn unless the nut turns with it.
Karen Blymyer c
Not sure if you want a bike to idle as high as possible, heard over time it’s not the best for the bike. Cheers now!
Going out lowers idle going in brings it up the low jet could be wrong a lot of race bike they do that so they run a little lean for more power hint why you rebuild ever two races
BTW you should do this with the engine hot
2 turns to the left and 2 turns to the right. Got it, thanks man!
Right then left. Then up and down
😅😅😅😅
Thanks for the help my 2000 yz125 was idling to low and this video helped me fix it in 5 minutes with the proper tools
It's good to have your bike idle just enough to where it doesn't want to die. But folks, the main thing is. Two strokes aren't meant to sit and idle like a four stroke! They like to be wide open! Don't let your two stroke idle for too long.
+Garner Wilson lol I let my 250sx KTM idle all day and nothing happens to her, Just put in a new top end and the power valve was cleaner then a lot of 2 strokes. This whole 2 stroke should not idle bs is such crap. I've never had a problem with it.
+Thom 1883 awesome man. I guess I just stick with my method and it works. But I hear ya.
+Thom 1883 It's just more of a chance of idle causes fouled plugs, what ratio do you run if you don't mind? I had one and let it idle quite a bit and never had problems either. That was like 16 years ago though so no clue what I was running, I wanna say 32:1
Triston Charge
I run 50:1 with amsoil Intercepter, always done good with that. i spooge a bit on the single trails but she runs amazing regardless :)
Yeah I been reading on a lot of forums of guys who do it both ways but out of all the guys who choose to not let it idle there are little to none of them that had problems when they let their bikes idle.. I mean obviously I wouldn't just leave my bike idle for long whether it is a 4 stroke or 2 stroke but I think its all just preference..
Suppose to tighten the nut with a wrench while you use the Philips head to hold the screw in place. Tighting with a socket probably moved the screw....
I freakin love you bro! I saved up my whole life to get my yz125 and It wasn't idling and I was freaking out! This solved it!! THANK YOU!!!
cant wait till i get a yz (which will be in a long time)
@@MM-zt4oe its been a long time. Wheres your yz myguy!
I got yz125 2003 a month ago I love it
@@MM-zt4oeDid you get it after 9 years?
You sir are a lifesaver.
It helps to have the bike warmed up using 5-10 mins of short on and off riding before you touch the idle so the bike is warm because what you will find is the bike will iddle nice when it hasnt been warm properly then five minutes down the road when its warm, itll rev quite alot higher than it did when you were adjusting it, but thank you this video did help me out on my Yam Yam too
Generally with popular bikes you turn clockwise to raise idle and anti-clockwise to decrease... but there is A MIXTURE SCREW THAT IS IMPORTANT... Firstly set the idle adjuster so that the bike is at lowest rpm without stalling.
Now to adjust the mixture screw - find another little screw that just goes into the carb. and doesn't hold anything on etc. it should be flat-head screwdriver, have the bike off and turn it in until it seats, turn it out 1.5 turns (1 turn is 360 degrees of the screw), start the bike and turn the mixture screw anti-clockwise until the revs get to the highest point (when adjusting any of these screws only move them a little bit at a time, then wait 3-5secs), if it has more than 3 turns from seated then you either need a richer or leaner pilot jet... if your mixture screw was at the back of the carb. (near the air-filter) that means it was an Air screw, if it was at the front near the engine it was a Fuel screw.
Let's say your mixture screw had to be more than 3 turns out to get it to idle highest, that means if it was the Air screw go leaner on the pilot jet, if it was the Fuel screw go richer. A bigger number on the pilot jet means richer. Only go up or down 1 size at a time and once the new jet is installed, repeat the process I just explained.
NOTE: When adjusting the mixture it was just telling us about the pilot jet, we WERE NOT trying to adjust idle at all... the reason you need to know about the pilot jet is because that could be what is causing your bike to idle rough... so check that first. If the mixture screw is less than 3 turns from seated to make it idle highest... then your pilot is correct, so go ahead and leave the mixture screw right where the idle was highest and fine tune with the idle adjuster.
______
-- 2 stroke motocross bikes do idle smoothly but aren't designed to idle for more than about 1:30mins (some oil the plug quicker than others), it's the owner's choice of tuning that makes it idle or not.. tuning for more performance can sometimes mean the bike won't idle smoothly, especially if there are serious engine modifications. But if it just has a pipe and reeds etc. you should be able to get it to idle well.
_______
-- 4 stroke -- All this is the same on a 4 stroke carb. except they can idle for longer periods, typically you don't want to idle a 4 stroke motocross bike for more than 4mins though as it gets too hot, it needs air going over the radiators to keep it at a normal temperature.
Can h make a video on how to do everything you just said
Thankyou
Great job thoroughly explaining, i second everything you said. I about lost my mind watching this young man figure out nothing but how to set the slide height a little higher. Air mixture screw is on the same side of the carb but by the air boot on the bottom.
Nice bike, and thanks for breaking it down into steps
Thank you for making this video! My '01 YZ125 was kept bogging down if I started it cold with no choke. The idle made the difference!
OriginaLucas You always start an cold engine with choke
YAMAHA Jacky Not necessarily. In many cases I've started my bike in warm weather with no choke after the first kick.
Really ^^
+OriginaLucas
It's running lean before it gets hot, Let it get warm and use choke if bogging, And don't put any load on the engine before it's getting warm.
It wouldn't be a bad idea to make sure you're float adjustment is to spec first. And I like to warm the bike up first, before I do any pilot, and idle adjustments . A lot of things to consider when tuning your carb. Check your spark plug after running it at w.o.t , it will tell you how she is running just by the color of the insulator under the electrode. Just some friendly advice . Sweet bike btw
Killer advice man, you know what you're talking about. And thanks but the bike is gone sadly. Onto a 2021 YZ250 at the moment!
wow thanks bro i have the same exactly idle problem.. mine has gotten better but at one point i had to constantly bump start it because it would shut off during riding
We have the same petrol cap but I have a yz 85 and my petrol cap is gold instead of the blue colour you have
good ole' Loogle, thanks for the video.
on my 125 i had to use a box end because when you go to tighten up the nut the little screw turn with the nut
Thanks this helped me a lot
Nice bike man, have same yz in garage :) not much idle problem i hear. when i bought the bike it idle same as yours and then cleaned and oiled filter, cleand carb, reeds, decarbonized all exhoust system and and after i was like.. damn that bike can rip my arms off one day :D
my dirtbike doesnt idle. i have to keep reving it to keep it running. is there anyway you can tell me how tyo fix it
a word of advise when turning up the idle speed get your engine running and hold the throttle at the target idle speed and screw the screw in till you meet the slide, else you end up with the problem i just had bike revs sticking and cant get a reliable idle speed because you drilled a shiny divot into your throttle slide with the rev set screw, open throttle screw in a tad release throttle and allow the slide to come to rest on the screw until desired idle is achieved, ive just had to dremel mine to smooth out a divot that was causing hanging revs or cutting out and now it idles reliably
The idle screw on my bike is plastic....
Thanks my guyyyyy this helped alot.
see my yz ticks over when I first start her up but when she gets warn she cuts out be that's for this video I try it when I get home. If you put more stuff on TH-cam that no else has plz do Il like to learn more about my yz 125 xx thank you. nice bike !!
One word: Manual. Helps a lot. Taking stuff apart to see how it works helps a lot too. Preciate the video though.
thank you soooo much!!! so helpful!
Thanks for the video...it really help me out with adjusting my idle on my yz125. But it still tries to bog in first gear.
Maybe clean the carb
Hey I'm a newbie and I was wondering on some tips
My old man got me a Honda Cr 125 2 stroke 03 model second hand
and I tried to kick start it (spark plug brand new) and it just doesn't want to start
Me and my mates tried to push start it and it didn't go either we tried to start it in second gear got it started but it sounded really terrible and just died on us
could it be the carb?
That wouldve cost like 20 bux for a shop to do, now everyone heres turning air fuel screws whichever way they feel. Im gonna open me a shop doing rebuilds cus theres about 4000 of em coming soon lol
Dan Lane haha ppl turning air screws like it's going outta style dammit who leaked this cat outta the bag?!?👀
Right, how you want your 2cycle done? Lean and cooked or rich and runny?!?!
So why not save 20 bucks and do it your self like a man
Box wrench doesn't fit in there and I do use a socket wrench but I had to use an adapter that kind of looked like a screw driver. Plus box wrenches strip alot easier.
The more you turn the screw in the more you push the carberatour throttle shaft up,the same as when u turn the throttle the throttle shaft will come up letting more gas and air in
hello i have a problem! my bike run out of fuel and now after i clean carb and put a new faange it runs on idle but when i give gaz she goes like " Boo gum booo gum !! lol i dont know what else to do! if i put iton first she goes down and wont start with the kickstart only by pushing it i manage to turn her on again! MAYBE some mechanic thing? ? ty
nice bike and thanks for doing this video i did it and it worked
N-STYLE. I have an 05'. Not sure if they have them for your bike though.
Same problem with my bike thanks for help yo
i was looking at this video, and then i decided to check my bike too, i adjusted that screw and now it idles perfect. (still have to kick it harder than normal)
Thanks my bike kept dying but this helped
Nice Graphics where did u get them?
Service manual is your friend. Yamaha happens to make very good manuals and this is all in there, including adjustment of the air screw.
I understand that racing bikes don't idle well. My ktm 85 2013 idles like a dream in neutral bur as soon as I click it in gear it drops dead. I have to rev before I click into gear otherwise it stalls out-what could I do?
Sounds like your clutch is dragging. If it's idling fine in neutral then dies when you shift in gear it's cause your clutch needs adjusting most likely
i have a question my 2000 yz125 has a really
looks kickstarter and it slides down on the pipe, how can i fix this
Should be something that swivels it in and out. Maybe a screw is loose or worn. Maybe look into a replacement.
Please tell me where you can find those graphics, and what kind they are... I have a 2001 yz 125 and I cant find any that I like haha, it'd be greatly appreciated. They're sick graphics. Also Good tutorial.
Will this work for a trial bike??
just a question i have a 2 stroke kx 125 Kawasaki im wondering if your suppost to use your throttle in small burst like bam bam bam i used to hold it open all the time and im pretty sure thats what made my top end blow and not knowing what to maintenance on the bike i just need to know for sure tho
thanks
If you ride with it wide open you should probably replace the top end every now and then. It certainly isn't the worst. These engines are made for it. But yes, its going to blow if you don't replace it and cause damage to a point where you may need to bore it out and put a large top end in!
So is this not good for it?
Thank you mate! Appreciated. Having the same issue with my brand new 2021 yz125
Hey I actually had the same thing going on with my 2021 YZ250! That may help but what I did was drained the gas out from the shop, swiveled my carb and cleaned out my jets. The pilot was completely clogged and I kept fouling plugs. They run 15:1 for break in at the dealership. Its pretty common to have a rough idle and/or stalling right out the box haha.
@@colinchilds sweet mate thanks for the detailed response. What I did to get mine going was turn the gas tap off and drain the excess fuel from the carb. Then choke on and twist the grip for a kick-start. To my surprise it started and ran rich. But since you've showed me this tuning tip I think I'll be sweet. I didn't have to change a plug either so winning haha
@@colinchilds just bought a 2008 yz125 in great condition, come home and have the same problem so gonna give this a try tomorrow
@@colinchilds update, doesn’t die now, but the carburetor is leaking oil/gas after i turn the bike off and warm it up 😭 help me
@@petermcmonagle9492 hmm, I’m no expert mechanic but check where it’s leaking from. If it’s coming from the bowl overflow, your float may be stuck. But maybe not cuz the idle would most likely be held wide open lol if that were the case. Maybe a seal? Check with some forums. I’m sure if you take everything apart and rebuild it correctly with good seals/gaskets, you’ll be in good shape!
What u were turning is called the air screw. To adjust it. U turn all the way to the right. Then go by a half turn each time till the idles good
thank you for helping this poor fool
Wuh? He was turning the idle screw dude. But probably should have tried the air screw first.
mikuni and keihin have two totally different set ups he was doing the idle. air screw is below its a flat head
yeah bruh what? Air screws on the bottom and is set to stock. It is indeed a Keihin Carb
my yz125 wont idle when its warmed up. why is this? or is this normal?
It always helps when u have a buddy
Wow this video help me so much , what way did you turn it again?
Right and left 🤣. Don’t remember which ones leaner and richer. Sorry!
@@colinchilds 😂😂
Your bike is very clean. Good video and nice bike
Haha
Michael Van Kessel I don't get what is funny?
i don't get it too :D
hey. left is lean and increases rpms. right is rich and decreases them. just letting you know
Mc Fabulous no it’s not. He’s adjusting the idle screw not the air screw
Do you know what size nut is for the idle adjustment?
I don't off the top of my head and this videos pretty old but I'm guessing 10mm.
Does that idle sound close to perfect before he messed with it? I started on a 96 rm80, yz 80s, yz125s, that's exactly how we had idle. Barely able to keep itself running. If your hand isn't on the throttle turn it off. They aren't supposed to idle like a trail Enduro roach does parked in the woods
Well, although the manual does call to keep the lowest idle possible.. if it’s barely running or worse, stalling out on the track/trails it could be dangerous and an indication of a clogged pilot jet. This video is only a tutorial on how to adjust your idle on the fly to avoid those dangerous situations. Otherwise, lowest idle possible is recommended. But it still shouldn’t ever stall on its own. That’s a common misconception amongst the inbred community.
What Is the point of jetting and when is it necessary?
Jetting refers to how lean or rich your bike runs which just describes your fuel/air ratio going into the motor. If it's not set up right, you could be getting too much gas and not enough air into the engine causing bogging or fouling of plugs. Cameron Niemela has some good jetting tutorials to watch.
The majority of bikes either used or bought from the shop are already set up for the area you live in and run well. If you put a new pipe on or make some other modifications you may have to check jet sizes to insure proper jetting of your carb.
You'll get some similar results if your jets are clogged too so make sure they're cleaned out before making adjustments.
i had a 2001 yz250 once and it would idle good like that but then when you leave it idling for a bit it would drop down and be so low that the whole bike would shake but rarly stalled
thanks! great help!
My 2stroke yz85 idles fine but after a couple laps it wont idle when i stop it just cuts out?but starts back up fine an continues running until i stop again Is that pretty normal lol im new as to dirtbikes
Make sure you've got radiator fluid in there lol. Also whens the last time you had a top end rebuild??
What happens if u do it too much?
Well... your bike wouldn't run or the screw would come loose.
Thank you for this video. Got my yz125 idling wonderfully now.
thanks man really hepled\
Thanks. I know, i need a manual!
I did change my spark plug but thanks man.
they have tons of monster yz125 graphics excactly like those on ebay for 50 bucks for every year model
oh dude also check your spark plug cuz mine had the same exact problem then after i washed it it wouldn't even start so i called a friend he said change it and there you go my baby purrs like a cat!! Lon Live yzs gotta love em
Does anyone know if it’s suppose to idle lower than normal after you rev it
Maybe see if your fuel line or something is clean.
Back your ideal out till your bike shuts off and leave it never let a 2 stroke idle ever it burns your rings quickly just start it with some throttle warm her up a bit and go
Seems you have it pretty down pat heres a couple of tips:
when you adjusting your idle screw blip the throttle (sit on the bike) because almost every time you move the screw tighter then blip the throttle it will rev a little higher..
you may also want ot adjust your idle mixture screw also when you get around to that (can do a video if you wish)
All that does it lock my throttle In place, please help... my air screw will not fix my idle and I’ve installed the factory jets idk what else to do.
You probably need to check your throttle tube/cable
top end rebuild
Haha top end rebuild??? Why does everyone jump to that. Sounds like your float is stuck or out of place which is pretty common. Sometimes it'll free itself. But yes, could also be the throttle cable and/or tube if you've got that too tight to the bar. I have no doubt you've figured it out by now since this is one year ago lol.
hi i have the same graphics kit on my yz125 2001
I've got the mikuni VM carb
Looking for a tip. I just got a 2020 YZ 125 and it just did this weird thing where it sputtered out like the fuel switch was turned off. I was running well, fuel on, no choke, then started to bog when throttled higher, then 2 min later, it just ran deal. won't turn over even with choke on. do I have to adjust something on a new one?
Put gas in it.
dealer just said that they put a rich mixture in new bikes to break them in. plug was wasted. New plug is all it needed.
shigetasan haha makes total sense man. Glad you got that figured out
My yz125 when you start it or ride it it's really quite it's got an fmf turbine core 2 silencer and stock head pipe I rebuilt the bike to freshen up and it also takes awhile to catch up when going like late reaction could it be just not playing with clutch more or reving high enough or carb problem?? Or I have heard it could be reeds
i would say your jetting is off
Your bike is running lean. Needs to be rejetted
Dirt bikes are supposed to rev low if doesn't get reved a few times do u every see riders like my self but on a quad rev there bikes some times to keep running some times im not saying ur wrong all the way but im half right and u half right to thanks man
Thanks ,Rob
my friend dillon roach has the same sticker kit on his yz250f
Is that knocking and tapping at idle normal?
Yeah man. Typical 2 stroke
Why do you want it to idle.
so im not the only one who runs a renthal bar and pro taper grips. I have to adjust the idle on mine because its too high
right = closing the airway
left = opening the airway
if your bike jumps forward when you put it into gear, it means the clutch plates are warn out. Or you need to adjust your clutch
sergei kirsch I’ve got a yz125 too and my clutch works as it should, it doesn’t slip or anything but when I put it in first it does stall, should I adjust it or assume that the plates or worn
@jbreezyburr , I had same problem , just clean out the carb and blow out the jets, I did it an mines runnin healthy as a hourse
also a good tip when setting the idle is the position of the venturi. ***with the carb off the bike. your float level NEEDS to be correct before any of this
1. take the idle screw and with the venturi raised up turn the screw so the taper is all the way in.
2. drop the venturi back down so it sits on the idle screw and back the screw out until you see the venturi stop. then i adjust it so its not too high and not too low. when you look at the venturi from the exhaust side you should see a TINY bit of space between the front of the venturi and the exhaust port on the carb.
3. while you're down in there take out the pilot and main jet and give them a good cleaning.
4. take your idle air screw and back it out 1.5-2 turns.
5. start it up and adjust the idle air screw until it idles strong
6. then adjust your idle screw until it idles to your liking.
the whole point is the venturi needs to be set properly while the carb is off the bike. if you set the proper height, theres no way your bike wont fire up instantly. carburetors can be very tricky to dial in, especially for beginners and something as simple as the incorrect float height will cause a machine with great compression and spark to run incorrectly.
I am seeing that many of you are having problems with your idling. This video is absolutely great for the last step but is missing out some key points that need to be covered before idle speed is changed. I have a 2003 cr125 and will be making a video tomorrow at some point that covers the key points before you complete this step.
If any of you are still having a problem with your idle and are interested then just pop over to my chanel in the next day or so and I will walk you through it. :)
Same problem thanks
Thank you!
what year model is your yz 125
2005
All the way in and 2 full turns out
The reason it wasnt starting first kick sometimes was because theyre not made to start up and shut off all the time
Riaght riaght
Question all 2 stroke's have a button to cut it off ?
lakeyto gibson should do , my 2stroke yz85 has a engine stop button on the left handle
ALL bikes should...
the way you adjusted it to be OK idling at a stop is not going to keep the engine alive if you break quickly or go down a hill. needs to be higher rpm.
By going clockwise you'd be restricting fuel flow even more wouldn't you?
+the-ELiTE-boarder That screw simply makes it so that when you have the throttle closed, the throttle valve is open more. It just pushes on the throttle valve.
Does this damage the bike??
Emil Berger haha noo
no shit lol its called a idle screw.
thanks a bunch
Hold throttle lightly and then turn it
That is not an idle adjustment screw. You are messing with the air/fuel mixture screw. The "idle adjustment" screw is just the throttle screw on top of the carb. You adjust that which makes it like your throttle is being slightly opened.
My bike idles nice when warm but when i start it up for a first time it idles very high. any suggestions?
I have 2 125 and they both do that if tunned good.
it sould be good all that means is that there is only alittle of gas in the bowl and its just sucking more in
ktm motocross911 ok cause mine is like RING! for like 1-2 min then it sounds so nice like really good
Do you have the choke pulled in? If the choke is pulled in then your fine it is supposed to do that that is what 2stroke and 4 stroke bikes do when they are started cold with the choke is in but after 30 sec of choke on put the choke off then let it idle and if it does not want to idle keep it alive by lightly applying throttle then when you feel the cylinder with your hand or put your hand next to the cylinder and you feel heat and it still does not want to idle then you can turn the idle up a little make sure it is warmed up when you change the idle and then ride it good( get in the power and a couple of times) then see how it is idle in then and go from there
thanks
Can u ajust while the bike is on
+Ryan Phung yes you can if you can keep it alive
Indeed.. what he said
Thanks
Wow I realized I have a keihin carb mines different