Idle & Cold Start Screw adjustment how-to | late model KTM EXC dirt bikes with EFI systems
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- Опубліковано 17 лип 2021
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In this video we show you how to properly adjust both the idle screw and the cold start screw on late model EFI KTM dirt bikes.
Just want the dets? Turn the red screw to adjust idle. Turn the yellow screw to set the cold start.
Having your bike setup properly, particularly the idle setting, has a big impact on how easy the bike starts, how it runs when you're at low engine RPMs, and how easy it is to flame out or stall the bike. - Авто та транспорт
On a warmed up bike, adjust the idle (red) to spec, turn off bike, then back off on the choke screw all the way(yellow) push in choke screw (yellow) now start bike, no increase in idle yet due to choke screw (yellow) all the way out. Start turning in choke screw(yellow) in (one click at a time) until the idle goes up, then add three more clicks. choke is now set close to factory. adjust to taste. Then recheck on a cold bike!! This is how i did it after adding a Vortex ECU 👍👍👍👍 My Bike late model KTM 500EXC-F
This seems like a great and straight forward way of doing this, thanks!
Thanks brother
Thanks for this. Had idle issues after adding the jdtuner. This fixed it 👍👍
This is EXACTLY the same issues I was having after checking everything twice, adjusting the TPS richer, completely rebuilding the engine as I thought it was maybe a low compression issue, valves readjusted, in tank and in line fuel filters changed, coil tested, new plug, etc. It was due to the stupid cold start screw being adjusted way outta whack because at one point I adjusted it for idle instead of the red screw! The manual doesn’t even talk about the cold start being adjustable even. I just discovered the issue last night, and today found your video. Too funny. Cheers!
Yeah, it took me a while to figure this out too.
helpful video! I picked up FE 250 and had similar issue. Played around with it a bit and was able to get it figured out! The cold start was def my issue here with a recent cold front and bike would start, but shut off after a bit. Racked my head trying to figure out until this video. We ROCKIN NOW!
Awesome, yeah, it tripped me up for a little while too.
I Have been trying to figure out how to make the cold start pop back out, the service manual was no help. Your video solved my entire problem , Thanks for posting.
Just got the GET and have been having this issue since putting it on thank you!
Thanks man, way easier than diggin the manual out lol.
I just got one of these bikes and this video was super helpful. Many Thanks !!
Thanks for this really helpful
Setting idle to spec actually solves near-all flameout and stalling issues; power is smoother at low settings too.
Makes a lot of noise when it feels like it should be quieter (at idle) but these bikes are all about riding, not idling.
Great video!
Thanks for the video. I found the 24 300xcw manual is wrong regarding the cold start and idle. They copied the 23 300xcw, which is TPI, over to the 24 300xcw manual. My cold start was so backed out, counterclockwise, that when pushed in, it would not release when rolling the throttle forward. The manual also has the idle description backward. Turn the idle screw clockwise or in increases the idle.
My 2024TE300 manual is the same way. Just copied from the TPI model and completely unrelated to the TB I cold start and idle setup. So frustrating. Glad for this video to explain.
DUDE THANK YOU. EXACT PROBLEM EXACT MODS EXACT FIX.
Awesome 👍😎
Great info. Thanks!
Helpful asf‼️
Glad it helped
You can also shut off the choke by turning the throttle clockwise.
Yup, that's a good point. That's often how I do it
I just figured out how the yellow button is supposed to work. Mine was backed all the way out. I was confused, because if I pushed it in it wouldn’t stay, and I could also pull it out until it clicked. So confusing. Anyway, start winding the yellow in and then push it up to see if it clicks into place instead of doing nothing. When it clicks and stays in the ‘up’ position, operate the throttle (bike not running) and the button will pop down and lock into the downward position. I’m other words, if the yellow adjuster is backed all the way out, it won’t do this. Cheers!
Yup 👍
Thanks
This is exactly what my bike is doing!!! Ooo im soo hoping this does the trick how do i go about messing with the red screw can i go all the way in then back out some and go from there?? Wich way makes idle higher and lower clockwise speaking lol
Working on a 2021 Gas Gas MC250f. Having similar issues. What are the settings for the carb screws?
The red screw(idle) on my brand new 22 500exc is all the way in. Spring is bottomed out . Bike idles ok and seems like it could go up a tad.
Back the cold idle screw far enough out that it doesn't engage at all. Then warm up the bike and reset main idle. Set cold idle only when the bike is actually cold.
Is your 2022 near impossible to get into neutral?
@@saricbarcello4780 it’s gotten easier with my hours on the bike. A quick rev helps it slide into neutral
It pops the choke off when you turn the throttle in the opposite direction so spin it forward instead of back
I have the same set up as you: fmf and get ecu. Did you have any issues with low throttle surging / jerkyness?
Yes, on the Taco Moto custom map 2 I def did. On the full power map 1, it's been very stable (a little bit of backfire at very low throttle angles during decel because it's fueling too get up and go)
Any advice for bike cutting out at full throttle with the AIM ecu??
Have not tried that ECU. But you might look into it's settings. Could be something off with the fuel mapping. Might also be a throttle position error.
As far as I’m aware ktm want the idle to be at 2200 rpm so the oil pump works efficiently. Very high tbh but it seems KTM recommends it that way.
Yeah, they like it high.
good
Thanks
mine has the same problem that yours was doing early in the vid which way we’re you turning the red and hollow screws the get that fixed i could tell
They tighten and loosen with the same directions as any regular screw. You’ll have to play with them a bit to find which direction solves your problem.
I have same setup 2022 500 excf, get ecu and fmf 4.1 full system with SA removed. My bike has 6 hours and after starting cold has little puffs of white smoke when revving. Not much but did you notice this with your bike? Goes away completely after warmup and is very minor to begin with just wondering. Thank you for your video and time! Cheers -Ster
Good setup! I have not noticed any smoke at all. Sounds like it could potentially be water or oil (which may be a seal or even a head gasket) but I'd have to see it to guess further. Might just be unburnt fuel (the GET supplies a lot more fuel than stock).
Ster, most likely water vapor (steam) in the exhaust which is normal. My 22 does the same.
My fe 350 2019 does it on start up my mechanic said its water vapour condensation it gos away wen bike gets warm
I have a 23 350 exc-f deleted, pipe and JD jetting. When i cold start the bike, get it off choke and rev it for the first time i do get the slightest trace amount of “Smoke”. It could be water vapor or it could be unburnt fuel from being on choke and warming up. Point is mine does it too. I’m not worried about it. Now if i had 500 hours and it was puffing white I would be worried
How do you adjust the throttle to pop it back out ? There’s no videos on that that’s what I need trying to figure out how to get my start knob to pop back out by twisting the throttle the opposite direction on my 2017 yz450f please make a video on that !
On the KTM, with the cold start knob is engaged (pushed in) it'll idle high. To stop the high idle, twist the throttle backwards (off) a bit and it should release. If it doesn't, it may not be adjusted quite right. You can also pull down on the yellow adjuster to release high idle.
If it's not popping back out, it is not in far enough
Right, if it's not engaging, it can't be clicked off by the throttle return.
Read your manual. You need to setup throttle free play properly.
That’s highly unlikely to be out of adjustment unless the rider changed it at some point but it wouldn’t hurt to check.
Would be helpful to know if clockwise increases or decreases idle speed?
On the cold start screw, it opens the butterfly as you screw it further in. Can't remember on the idle screw.
Clockwise increases it, as per the Service manual.
👌
The yellow knob will turn when not pushed in but does it still change adjustment or must it be pushed in to achieve cold idle adjustment?
So both actually. When you push it in, you're propping open the butterfly. How much open depends on how you adjust the screw. But, if you turn the screw in too far, it'll actually start to open the butterfly even when it's not "engaged". I've talked to a lot of people (myself included at first) who mistakenly adjust their idle using the yellow screw. This is incorrect, and will cause issues starting when the bike is warm.
@@ExtremeSportsWannaBes So whether or not the yellow knob is out and turned or pushed in and turned, the same effect happens, turning opens the butterfly. I was under the impression that one would have to push in the yellow knob and turn it. I have one that when pushed in for fast idle it works as it should. Revs are higher. Turn the throttle grip forward in a minute and it disengages. All good. Revs drop but as it warms up the normal idle never gets to spec. I've turned the red knob in as far as it will go to no avail. I might have another issue to sort out. Thanks for your response.
The yellow screw is likely your issue. It's supposed to only "engage" when you press it up for cold start (like chokes on carb bikes). When you press it up for a cold start, you can also screw it in or out to adjust how much effect it has on cold start.
However, if you disengage it (pull it down) you can still turn it very far in and have it start to open the butterfly even though it's not actually "engaged". In this case, you'll never get your idle set quite right (though it can at first seem like you are actually adjusting basic idle as it has a similar effect). You will have cold start, and some warm idle, but once fully warm, you'll have hard starting and erratic or inconsistent idle speeds.
The thing to do is back the yellow screw out most of the way (so no chance it can engage). It won't work for cold start, even if you push it up, but that's just step one.
Then, warm the bike up fully (first fan start, or 180 degrees ish). Now, let idle and adjust the red screw until the bike runs around 1800 RPM (the suggested idle speed). On mine, this requires turning the red screw very far down (I actually thought I'd hit the stop by compressing the spring fully, but when I tried harder, I was able to adjust a bit further). With idle set like this, you should be running fine. Next time you cold start the bike, engage the yellow screw and adjust inward until you get an appropriate amount of cold "high" idle. Disengage and ride.
Following this, you should be able to get idle set right. If this does not work, might look at other causes (such as if you use an aftermarket ECU, check throttle position setting, etc).
@ExtremeSportsWannaBes This is what I have been searching for all over the internet for, and here it is! Installed a GET on my 501 today and my idle was either screaming or wouldn't start at all, depending on rather the choke was engaged. Thank you so much for this information. Cheers bro!
So if mine is having trouble starting at hot temps I need to adjust the red screw by twisting it in?
Idle probably won’t affect starting. If the bike won’t stay running, you might try turning up your idle speed.
@@ExtremeSportsWannaBeswould the yellow affect starting? My bike takes 1-5 minutes to get started (sometimes it won’t even start)
Compression is 180 psi, valves all within spec, new plug and fresh gas, has good spark.
I just got a 2019 fc 250 when the choke is pushed in it runs really high revs how do i adjust this back down to normal cold start rpm qs the revs are way to high? Thanks
I believe the FC250 is set up the same as my 500. If so, there are yellow and red adjustment screws. Red controls the idle when warm. Yellow controls the cold idle if engaged. To decrease the cold idle speed back the yellow screw out/down until it runs where you like it.
@@ExtremeSportsWannaBes perfect thanks really appreciate it, will give it a try does this have to be done when bike is at running temp or cold?
@@jamestansey6115 back the cold idle way off so it's not engaged. Then warm up the bike and set regular idle properly. Then when the bike is cold next time, engage and set the cold idle.
Having problem adjusting idle, so my KTM 350 SXF 2017 won't start at all. I've had it start 2 times, but dies really fast, and then it won't start at the same adjustment again. The battery got flat 3 times now, so I really need some help. Anyone got any tips on how to find the right idle fast?
If it's just a problem with the idle being far out of adjustment, then you should be able to start it and hold the throttle a little open to keep it running while you adjust the screw. If the throttle won't keep it alive, it's probably not the idle but something else wrong.
@@ExtremeSportsWannaBes Have any tips on what I should try?
Engines are pretty simple. They need air, fuel, and a spark. Check all three and see what's missing. We know a guy who left a plastic glove in the air box, and we've sometimes forgotten to turn our fuel on. If it's nothing that simple, check that fuel is flowing from the tank. If the bike is carbureted, remove and completely clean the carb, if it's fuel injected, you may need to check the fuel pump and injectors. Could also be an issue with the ECU.
@@ExtremeSportsWannaBes Okay! Thank you for the tips :)
Hey, I just purchased a 2024 ktm xc-w. When I push in the cold start button, let it idle for a minute, then blip the throttle the cold start button doesn't pop back out. I have to manually pull it back out. Is that normal?
Go forward with your throttle and it releases
@@LittleOLosBurnouts thanks man, figured that out last week finally
Mine says 22-2300 rpm
The manual explains all of this already, but you didn’t close out the video with yours all dialed in and how you completed the setup. Just said you were going to get it all setup later and then ended the video, lol
This bike has been a journey. Unfortunately I filmed a lot of stuff at once so didn’t always have a finished bike after each segment.
I bought my bike and it didn't come with a manual so this is very helpful
It doesn’t actually work anything like a choke
Didn't learn anything from that