How To Diagnose And Fix A High Idle On Dirtbike!

A very high idle can be caused by an air leak or the throttle assembly. Air leaks are common along the air boot or the intake manifold. If you are more unlucky an air leak can appear in your left crank seal. Check the easy things first starting with your air filter, then moving along towards your throttle assembly to make sure your cable is not sticking. My problem ended up being a chipped carb slide.

[@anthonyraucci9304]

Bro. U are a savior. No other KZbinr was even close to know what my problem was. Thank you so much. You deserve more clout. Good luck on your journey

[@andrewschwartz_]

glad to help man hope you get your bike running

[@samwatkins6319]

My cr125 had the same problem with the cracked slide. Mine actually ran away a few times as well. I ended up putting a lectron carb on mine and it was a bit expensive but well worth the money.

[@andrewschwartz_]

Exactly what I did with mine. buy once, cry once!

[@Tax2Me]

Amazing troubleshooting skills bro. So cool and calm. Hope by now you found a fix for it. Thanks for sharing

[@Redlakeisawsome]

Nas the world is yours for the beat. Good choice

[@Marco-bp4nt]

God bless for the tips man, just bought a 99 wr360, scared the shit out of me thought it was going to blow up before I managed to kill it by tipping it over. Wide open on kick, figure it's the cable sticking so I'm taking the carb apart to inspect the needle and everything else. I'll put grease everywhere I can just incase there's an air leak.

[@JOSUE_LENIN]

Did u fix it?

[@Marco-bp4nt]

@@JOSUE_LENIN yep fixed it throttle cable was routed wrong

[@ispgravy4233]

@@Marco-bp4nt how to route it right?

[@kerac0239]

Thanks man you helped me diagnose my rm.

[@trumanhampton1845]

Underrated asf legit tried everything on my bike

[@jamielesage8387]

Same exact thing happened to my cr125.couldn’t find a slide anywhere so we ended up having to buy a whole new carb

[@andrewschwartz_]

Yep. Bought myself a Lectron carb.

[@muddymotos5003]

Thanks for the help, you deserve more subs

[@user.--13]

Dude when this first happened it scared the shit out of me I was so scared to even ride it lol. But it was the choke for some reason when I put the choke back in it was fine

[@tammydeluca2291]

Exact same thing my 1991 KX125-H2 does. Thanks so much for the help!!!

[@yolo2225]

By far the best information, thank you bro soo much! 🤙🏼🤩

[@JackMacdonald-ih3ht]

Mine goes up and down up and down thoughts?

[@brandonkush.285.0]

Exactly how mine was going hopefully this fixes it

[@suryajs2925]

I'm having a problem with my suzuki Ax100 2 stroke , once i turn the fuel off, and the fuel in carb bowl is about to get get over, the bike shoots up in RPM, i know it gets a bit lean, my Yamaha does the same thing, but the bike dies in a few seconds, but my suzuki doesn't, it just shoots up and up...even Turning the ignition off won't kill the engine, it still keeps running ( rpm about 10k+) what could possibly be wrong? Another thing i noticed is that the carb becomes so chill, like an ice cube when the bike is running. Any help appreciated

[@andrewschwartz_]

My guess is air leak or stuck throttle cable. You can't kill the bike because the kill switch is being overpowered by the spark from your engine turning. Also the carb becomes cold to the touch the same way refrigerators do. I'd check the cable first and if that doesn't work put some heavy grease over any engine gaskets or possible carb leaks and see if your revs go down.

[@eddymofo3359]

I had this problem and it was just a throttle cable had popped out of its position. So check the cables properly b4 anything.

[@StevenBird-wf6ey]

Good tips , my 83 kdx200 is idling high just like yours I'm not sure yet what is causing it , thanks

[@guitarTennisCarHomeFixFlying]

It appear to be an excellent mechanic I couldn't hear what kind of valve you said that was that was a broken what kind of valve was that?

[@xdmichal7776]

i have the same problem but it started after i cleaned the carb, hopefully this helps

[@physics1874]

So I removed my carburetor to have someone rebuild it and when I put it back on I was struggling to put the airbox back in place, I don’t think I connected it probably to the carb. This is definitely the cause right?

[@caleb9676]

My dirtbike starts and is stuck at full throttle when I start it any suggestions?

[@eastonwaits1964]

The slide on the carb might be in wrong

[@johnsxn661]

@Trenton Rodrigues same with me I'm stumped I think it's either my jetting or else an air leak between carb and manifolf

[@rspecs683]

@@johnsxn661 check the throttle cable like where the throttle enters the carb it could be placed wrong

[@finisher8783]

Hey Andrew I have a problem with my 2 stroke Cr80r and was wondering if you can give me a idea.The problem is that it takes a while to start and it’s been sitting for like 2 months and when I start it it sounds like the bike in the beginning of the video

[@mer5307]

I just rebuilt a PW80 that had sat for a while. Reeds were stuck open, and both crank seals were shot. All in all the seals were $20 and cleaning the reeds was free. Just some time breaking things down and putting them back the right way

[@robbed_of_sanity]

Nice work Anthony 👍🏻

[@Creative-content24-7]

So my rm85 idles very high when I start it up, and it's got a crack on the intake manifold, could this be the problem?

[@andrewschwartz_]

yeah I'd say that's the place to start. try to put some thick grease over the crack to seal it. If the revs go down that's the problem

[@Creative-content24-7]

Will it's a 1999 social cant find the part for it so I was hoping sealent would work on it tbh

[@thealvaco]

Very good video man. Well done!

[@TheRealCozy]

Yeah my 97 RM125 is currently doing this after top and bottom rebuild

[@TheRealCozy]

Mostly from the immediate kick over and it revs straight through the roof. I know my carb is good to go. So I figure it’s gonna be a bad boot for the carb or something

[@imabush3475]

My bike high idles and has rich smoke so I really have no idea what it could be. It was running perfectly fine and than out of no where this happened. I changed the cylinder head gasket. And also when I pull the choke up it idles fine b when I put it down it high idles. I literally have no clue what it could be. It could honestly be more than one thing b I doubt it would be the crank seals cause I just chnaged them a few months ago

[@mrburn6119]

get a can of carb spray and spray around all possible leak areas when the bike is running (on choke),. My bike over revs but spraying carb spray at the air box join causes a stall. New gasket ordered. Fingers crossed.

[@andrewschwartz_]

If it's not top/bottom end im guessing it's your float. Or it may be your jetting. Maybe something's clogged? I had the same problem and my solution was a stuck float. Hope this helps

[@Andrew-Knecht]

I need help. I fell off of my bike doing a wheelie like a moron. I had to replace the silencer, because the hanger was bent. The header pipe has a slight bend, but the new fmf slid right on and I put the bolts in. It starts fine. If I rev it, it will continue to stay loud. Air screw position is within spec. Idle screw doesn’t really do anything. It just holds the rev even when I’m not revving it. The bike also goes by itself without any throttle. When I have the kickstand down it will move on it’s own. Also when I fell off my throttle was stuck. I took the throttle apart and I fixed that issue. Throttle feels normal. Please help if you can. Thanks.

[@willhelphingstine7494]

You ever figure that out? Seems like my problem

[@Andrew-Knecht]

@@willhelphingstine7494 that was a while ago, but I remember adjusting the throttle cable by the throttle. That got rid of the high idle issue and yours most likely needs to be adjusted correctly. I watched a video on how to mess with the throttle cable and ended up getting it done correctly pretty quickly for my first time messing with the cable.

[@bryanjones7126]

Good vid! Thanks for posting!

[@obsidian_power]

it was beatiful to watch the whole vid

[@Prillbarky]

The world is yours

[@derf9300]

God tier song

[@teiyesigrah4146]

Pls help 2004 Rm 250 2stroke same problem before & after I cleaned off the carburetor 🤷‍♂️

[@cameroncokenorris7005]

Thanks dude!

[@rock3rd]

My bike is doing the same, my slide isn’t broke but there is 2 scratches on each side on the filter side. Could that b issue? If i have one of the air screws wrong could that make it rev to moon on start up

[@Grzybo93]

How did "The World Is Yours" beat not get claimed by YT?

[@andrewschwartz_]

not sure I was worried my video would get taken down after I posted it haha

[@adammartinez1887]

Hey bro I accidentally hit gas in my motor oil I changed out the oil and cleaned it with motor flush and it turn on fine now but it doesn’t turn off when I hit the kill switch and it’s really loud what can I do ??

[@dannyoliver8354]

Help me heaps i just replaced reed and in boot not mine rpms really high wen touching throttle little bit...thinki g maybe leak????...thanks mate

[@ras_jokah420]

My raptor 700 just started doing this and I have a 22 model. Could it be diagnosed even though it's 2 different machines

[@j.a.y.joyfullyawareyo7629]

What do you do if that didn’t work?

[@RajdeepSingh-yo4rl]

Thank you so much mine is having the same problem it’s a Baja Dirt Runner 125cc Chinese bike and it’s starts high RPMs I any ideas any help ?

[@pop_major4698]

did you end up finding out the problem i know it’s late 😂😂 but i have a chinese too and it literally screams when i start it up

[@Vanilla_Phil]

Just bought a brand new Apollo X19. Started idleing high the second day I had it. Not sure what to do..

[@mateo8564]

first mistake was buying an apollo

[@RealNikoBellic]

Did you ever figure the problem out? Having the same issue on a new x18 with 2 different carbs.

[@TREVVV2x]

did you ever figure out the problem cause I’m having the same problem...

[@RealNikoBellic]

@@TREVVV2x Havent had much luck sadly. I did contact the company I got it from and they (for some reason) think its the carb, and are sending a new one. I on the other hand think the throttle and or cable are defective from factory and have ordered new ones. Before you buy anything try to loosen your throttle cable and see if it helps.

[@TREVVV2x]

@@RealNikoBellic Thank you so much!!This helped with the idling along with adjusting the idling screw again... you saved me some money lol 😂

[@benjaminnoonan3783]

Very helpful thanks

[@tyrrellzolbe]

So was it just idling high at start ? I have the same slide problem , It idles really high at start but then comes down to normal. If the idle problem isn’t my slide cool. Otherwise I’m gonna try to braze it. 7:03

[@kadanv8974]

Hey, so I decided to do the top end on my 05 yz 250. I replaced the top end gasket, the o rings on the head, the power valve case gasket and the piston and rings of course. After putting everything back together, I started having extremely high idling. Almost as though the throttle is wide open. I checked the throttle cable, and there seems to be no issues. It doesn’t stick, and completely closes as normal. And I never had any issues with this bike before. I also never touched the carb. My bike was idling perfect before the rebuild. What could it be?

[@kushtrimavdyli8228]

you ever fogure this out pretty much same thing happening to me now

[@kadanv8974]

@@kushtrimavdyli8228 yeah, it was the o rings. I didn’t torque the head to spec and it was over tightened. So it didn’t seal properly.

[@jordanlopez3511]

What o rings ?

[@jordanlopez3511]

@@kadanv8974 what o rings ?

[@johnsxn661]

I recently replaced my carb on my pit bike and now it is redlining when start it without using the throttle, I believe its a gasket leak between my carb and manifold but I'm not entirely sure any opinions

[@andrewschwartz_]

can be a stuck throttle cable or like you said an air leak. Check the cable first and if that doesn't work put some thick grease over your connecting tube and reed valve joint and and see if that stops the revs.

[@imsoz7741]

I have a 96 kx250 and when I rev just a little bit the rpm’s go up like I’m half way pinned what’s the issue?

[@got2getit204]

You ever find out what it was???

[@urielarguelles4974]

Bro I came for a simple answer 😂😂😂😂😂 wtf

[@gtmemories67]

Same problem in my scooty

[@GreatBirdOfHope]

What screwdriver type??

[@MarioRodriguez-dg8vf]

Have u fixed it yet i have the same problem on my 2000 suzuki rm 250

[@andrewschwartz_]

Purchased a lectron, fixed my problem

[@im-that-guy-pal]

You almost had catastrophic engine failure.

[@gabemuniz7882]

i rev my bike and it stops and when I idle it sounds weird any reasons why?

[@andrewschwartz_]

Sounds like jetting or bad adjustment. Cameron Niemela made a video explaining it here- kzbin.info/www/bejne/ZpXMXqGvra2VqaM and kzbin.info/www/bejne/nn3Jf2agnrmfZ6s

[@cameroncokenorris7005]

Jets

[@edawggaming]

I have this rm85 and it idles really really high and it sounds like reeds are going crazy and there's coolant leaking from the cylinder any ideas why?

[@kenarkoltsov]

Same problem

[@edawggaming]

@@kenarkoltsov i figured it out check around for any missing bolts around the top end area that was my problem.

[@edawggaming]

@@kenarkoltsov this one bolt made the whole bike go bonkers

[@HSO-ro3bd]

@@edawggaming I have the exact same bike mines works well, it's just it gets into high rpm by it's self when you first start it.

[@edawggaming]

@@HSO-ro3bd there should be a idle adjust screw on your carb try to mess around with that and get the perfect idle

[@MicrowaveEvil]

BROS handsome

[@sergioalaniz3342]

Cool cool

[@LilDevin22]

Can anyone help me fix the problem to my bike 2003 cr85rb, so I start the bike up an it’s a very loud high revving sounding the the throttle cable is stuck so when I put the bike in first gear the bike flys an throws me off idk if it’s the carb or the throttle cable.?

[@finisher8783]

Hey man yea I have the same problem it sound like in pulling the throttle back and sound super loud pls reply if you have found the problem

[@JOSUE_LENIN]

Did yah fix the problem

[@finisher8783]

@@JOSUE_LENIN yes I did thank you

[@JOSUE_LENIN]

what was the issue

[@finisher8783]

@@JOSUE_LENIN carburetor

[@Hasangurbiyikli]

My god man you can ride it like this fore ever do but it is anoying you cant get in powerband or some times it opens it self bcauese of high rpm if it happent to you god luck 🤣

[@Body_Dropped]

Quick question I have a cr250r as well this weekend I took it out to ride and once I was revving it a bit to warm it up I took it for a spin then kept revving it a bit and out of no where it starts to over rev itself and I try to push the kill switch and it didn't work then I unplugged the spark plug wire and it didn't work then I turned off the fuel and disconnected a fuel line and then after a bit it shut off. What can be the cause of that? Maybe needs a new carb?

[@andrewschwartz_]

Do you have an aftermarket head? The self-ignition part is pointing towards wayyy too much compression+heat. This would also explain the rpm.

[@Body_Dropped]

@andrewschwartz_ no the guy I got the bike from said he rebuilt it and it's the stock engine

[@andrewschwartz_]

Regardless, self-ignition is not good. Maybe you accidentally filled er up with diesel and it was able to ignite? Sounds goofy but check that first. If not it's probably not a bad idea to do a compression test and change spark plugs or check your top-end clearances entirely. I don't think this has much to do with your carb. @@Body_Dropped

[@Body_Dropped]

@@andrewschwartz_ gotcha cool to man know thanks, the guy I bought it from also recommended me to get a new carb for it that the one it has right now is crappy