125/150/250/300 KTM/HUS/GG jetting thread

jcp411
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jcp411 4/28/2022 11:30am
4/28/2022 11:30am
jcp411 wrote:
I have a 2022 KTM 125xc used the jetting from the first page. Runs good but has a bog off idle 😢 is that a lean...
I have a 2022 KTM 125xc used the jetting from the first page. Runs good but has a bog off idle 😢 is that a lean spot for that to happen? This is my first 125 in 10+ years and tuning isn’t my game, but trying to learn. Any help would be fantastic.
AJ565 wrote:
Read the few posts above yours, there is a known problem with the ‘22 that hasn’t been solved yet.
Well that sucks!! What changed i wonder.
jcp411
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jcp411 4/28/2022 11:32am
4/28/2022 11:32am
gahooligan wrote:
Try the jetting I listed above with the red PV spring at no more than one turn in from full out. You have everything you need...
Try the jetting I listed above with the red PV spring at no more than one turn in from full out. You have everything you need, it came in the optional jetting Also set your idle a bit higher till it revs out clean on the stand when fully watm if you whack the throttle. Try it, what have you got to lose but literally 15min and $3 for the spring.
So it’s not going to hurt the engine? So I’m good to ride that way? I’ll give that a shot! Thanks for the help!! Is the bog a lean condition?
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gahooligan 4/28/2022 2:14pm
4/28/2022 2:14pm
Most of us have no clue what is causing it and a lot of knowledgeable people have tried to solve it. The jetting i am running will not harm the bike. It runs clean of you wring it oit and will have the very slightest spooge if i ride at a slowerpace down the trails with my son. I have had zero issues so far and it is the best the bike has ran with any jetting and the least spooge.
If you try to richen the bottom of the thread jetting from the 1st page it switches to a rich burbble of bottom with no inbetween. I tried the jetting I listed and run the idle jist high enough that it will pull clean if you rip the throttle open fully on the stand from idle. The bike MUST be fully warm. This is after its warm and the air screw adjustment srill comes into play. (using the actual idle adj screw for the slide, not the air screw) Keep going back and forth with the AS and idle till you get the lowest idle (its still going to be elevated) and the bike will still pull clean on the stand. Also it starts first kick , or one press of the magic button, when hot or stalled too. Like I said, try it, what do youbhave to lose. My jetting recommendation was from a local large ktm shop that sees a lot of these bikes.
jcp411
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jcp411 4/28/2022 3:06pm
4/28/2022 3:06pm
gahooligan wrote:
Most of us have no clue what is causing it and a lot of knowledgeable people have tried to solve it. The jetting i am running...
Most of us have no clue what is causing it and a lot of knowledgeable people have tried to solve it. The jetting i am running will not harm the bike. It runs clean of you wring it oit and will have the very slightest spooge if i ride at a slowerpace down the trails with my son. I have had zero issues so far and it is the best the bike has ran with any jetting and the least spooge.
If you try to richen the bottom of the thread jetting from the 1st page it switches to a rich burbble of bottom with no inbetween. I tried the jetting I listed and run the idle jist high enough that it will pull clean if you rip the throttle open fully on the stand from idle. The bike MUST be fully warm. This is after its warm and the air screw adjustment srill comes into play. (using the actual idle adj screw for the slide, not the air screw) Keep going back and forth with the AS and idle till you get the lowest idle (its still going to be elevated) and the bike will still pull clean on the stand. Also it starts first kick , or one press of the magic button, when hot or stalled too. Like I said, try it, what do youbhave to lose. My jetting recommendation was from a local large ktm shop that sees a lot of these bikes.
Thanks I’ll give it a go.

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jcp411
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jcp411 4/28/2022 5:39pm
4/28/2022 5:39pm
Ok so i just adjusted the PV to 1.75 turns i. From all the way out and good god it runs so good! I haven’t changed anything jetting wise. The bog it has doesn’t really affect me while riding. So I’m going to give a go this weekend and see how it is on the track and trails. Put a new plug in it last week and rode down the street a few times plug look lean. Maybe it needs more riding time to get color.
AJ565
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AJ565 4/28/2022 6:49pm
4/28/2022 6:49pm
jcp411 wrote:
Ok so i just adjusted the PV to 1.75 turns i. From all the way out and good god it runs so good! I haven’t changed...
Ok so i just adjusted the PV to 1.75 turns i. From all the way out and good god it runs so good! I haven’t changed anything jetting wise. The bog it has doesn’t really affect me while riding. So I’m going to give a go this weekend and see how it is on the track and trails. Put a new plug in it last week and rode down the street a few times plug look lean. Maybe it needs more riding time to get color.
That plug doesn’t really tell you anything. To get an accurate reading you need to cut the threads off and measure the base ring.
1
jcp411
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jcp411 4/28/2022 7:05pm
4/28/2022 7:05pm Edited Date/Time 4/28/2022 7:05pm
I’ve only ridden 4 times with that new plug, do you think i need to ride it more to get a more accurate reading
Just riding up and down the street
gahooligan
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gahooligan 4/28/2022 7:21pm
4/28/2022 7:21pm
jcp411 wrote:
Ok so i just adjusted the PV to 1.75 turns i. From all the way out and good god it runs so good! I haven’t changed...
Ok so i just adjusted the PV to 1.75 turns i. From all the way out and good god it runs so good! I haven’t changed anything jetting wise. The bog it has doesn’t really affect me while riding. So I’m going to give a go this weekend and see how it is on the track and trails. Put a new plug in it last week and rode down the street a few times plug look lean. Maybe it needs more riding time to get color.
AJ565 wrote:
That plug doesn’t really tell you anything. To get an accurate reading you need to cut the threads off and measure the base ring. [img]https://p.vitalmx.com/photos/forums/2022/04/28/546547/s1200_B0C54C43_E5E5_4F2E_8BB4_3DB9CCC17B68.jpg[/img]
That plug doesn’t really tell you anything. To get an accurate reading you need to cut the threads off and measure the base ring.
Lo, What is this grand sorcery you speaketh of???

Seriously. I love learning. Please explain. Is this some two stroke wizardry stuff??
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AJ565 4/28/2022 7:38pm
4/28/2022 7:38pm
jcp411 wrote:
I’ve only ridden 4 times with that new plug, do you think i need to ride it more to get a more accurate reading Just riding...
I’ve only ridden 4 times with that new plug, do you think i need to ride it more to get a more accurate reading
Just riding up and down the street
To do a real plug chop test you do a wide open 3rd gear pull with a brand new plug. get the bike warmed up with an old plug, swap the new one in and do the test. Pull in the clutch and kill the engine then cut the plug and measure the base ring. 2mm ring is what you want. Less means it’s lean and more means it’s rich. That tells you if your main circuit is tuned right. You can do the same for other areas of the jetting, but that will be a little different test and measurement. I only ride moto so most of my stuff is wide open and that’s the area I was concerned about since I have my jetting dialed in on the 250.
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AJ565 4/28/2022 7:39pm
4/28/2022 7:39pm
jcp411 wrote:
Ok so i just adjusted the PV to 1.75 turns i. From all the way out and good god it runs so good! I haven’t changed...
Ok so i just adjusted the PV to 1.75 turns i. From all the way out and good god it runs so good! I haven’t changed anything jetting wise. The bog it has doesn’t really affect me while riding. So I’m going to give a go this weekend and see how it is on the track and trails. Put a new plug in it last week and rode down the street a few times plug look lean. Maybe it needs more riding time to get color.
AJ565 wrote:
That plug doesn’t really tell you anything. To get an accurate reading you need to cut the threads off and measure the base ring. [img]https://p.vitalmx.com/photos/forums/2022/04/28/546547/s1200_B0C54C43_E5E5_4F2E_8BB4_3DB9CCC17B68.jpg[/img]
That plug doesn’t really tell you anything. To get an accurate reading you need to cut the threads off and measure the base ring.
gahooligan wrote:
Lo, What is this grand sorcery you speaketh of???

Seriously. I love learning. Please explain. Is this some two stroke wizardry stuff??
This applies to any engine 2 or 4 stroke. Google plug chop test and you’ll learn more then you’d ever think about a spark plug and air/fuel ratios.
Dirtdemon 5/3/2022 11:25pm
5/3/2022 11:25pm
gahooligan wrote:
Aj , i tried the richer needle and the 125xc runs great everywhere except right off the bottom. I just cant get it to pull clean...
Aj , i tried the richer needle and the 125xc runs great everywhere except right off the bottom. I just cant get it to pull clean it either bogs or burbbles. I cant find an in between. I have tried pilots, AS adjustments, needles, etc. Cant get rid of it. Do you think its possible the 5.0 is just too much for the 125 and I need a slide cut to 4.5 or 4.75?
digger wrote:
I see that you're trying to jet a 22' KTM/Husky model 125. I spent 2 days working on 2 different bikes trying to get them to...
I see that you're trying to jet a 22' KTM/Husky model 125. I spent 2 days working on 2 different bikes trying to get them to jet cleanly, or to atleast get them to a point that I thought was acceptable, I never achieved that. I also had 19' and 20'(125's) bikes there as well, and they would do exactly as I would expect them to do jetting wise. But those 22's, I was never able to get that bog that you are describing out of them, and I tried everything. I had my hands on everything in those carbs and nothing I changed made much of a difference. It was super frustrating. I even had him try a 38mm Keihin PWK at one point with a jetting setup that was super rich and It still bogged off the bottom. There is something wrong with those bikes that's not right. I'm not sure if it's a power valve or an ignition/electrical issue, but something isn't right. The one thing we did take away from it though, is that the red power valve spring from the 250/300's makes the bike much more responsive off the bottom.
I have a 20 and a 22.
Having the problem with bog from idle with the 22 bike.
I rebuilt the crank on the new bike at 1.5 hours. Safety for my son. So crank is not the fault.

tried different pilot jets, no good
Saw that the hoseclamp to airbox, doesnt work perfect. threads locks before you get a tif fit.

Could it be cdi unit ?
Anyone tried the old cdi to the new bike ?


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gahooligan 5/4/2022 6:14am
5/4/2022 6:14am
gahooligan wrote:
Aj , i tried the richer needle and the 125xc runs great everywhere except right off the bottom. I just cant get it to pull clean...
Aj , i tried the richer needle and the 125xc runs great everywhere except right off the bottom. I just cant get it to pull clean it either bogs or burbbles. I cant find an in between. I have tried pilots, AS adjustments, needles, etc. Cant get rid of it. Do you think its possible the 5.0 is just too much for the 125 and I need a slide cut to 4.5 or 4.75?
digger wrote:
I see that you're trying to jet a 22' KTM/Husky model 125. I spent 2 days working on 2 different bikes trying to get them to...
I see that you're trying to jet a 22' KTM/Husky model 125. I spent 2 days working on 2 different bikes trying to get them to jet cleanly, or to atleast get them to a point that I thought was acceptable, I never achieved that. I also had 19' and 20'(125's) bikes there as well, and they would do exactly as I would expect them to do jetting wise. But those 22's, I was never able to get that bog that you are describing out of them, and I tried everything. I had my hands on everything in those carbs and nothing I changed made much of a difference. It was super frustrating. I even had him try a 38mm Keihin PWK at one point with a jetting setup that was super rich and It still bogged off the bottom. There is something wrong with those bikes that's not right. I'm not sure if it's a power valve or an ignition/electrical issue, but something isn't right. The one thing we did take away from it though, is that the red power valve spring from the 250/300's makes the bike much more responsive off the bottom.
Dirtdemon wrote:
I have a 20 and a 22. Having the problem with bog from idle with the 22 bike. I rebuilt the crank on the new bike...
I have a 20 and a 22.
Having the problem with bog from idle with the 22 bike.
I rebuilt the crank on the new bike at 1.5 hours. Safety for my son. So crank is not the fault.

tried different pilot jets, no good
Saw that the hoseclamp to airbox, doesnt work perfect. threads locks before you get a tif fit.

Could it be cdi unit ?
Anyone tried the old cdi to the new bike ?


Did you try the jetting that I listed above that worked for me on the 22and set a bit higher idle? Mine does not bog anymore.
Mattshredsgnar 5/4/2022 9:40am
5/4/2022 9:40am
I feel like people are overthinking stuff. I didn’t notch my slide I didn’t do anything crazy and my bike runs perfect now. It’s a 19 250sx. It’s 42-71 needle/ 440 main/32.5 pilot/450 main when it’s really cold. No bog. Don’t buy JDJETTING
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FGR01 5/4/2022 9:52am
5/4/2022 9:52am
Dirtdemon wrote:
I have a 20 and a 22. Having the problem with bog from idle with the 22 bike. I rebuilt the crank on the new bike...
I have a 20 and a 22.
Having the problem with bog from idle with the 22 bike.
I rebuilt the crank on the new bike at 1.5 hours. Safety for my son. So crank is not the fault.

tried different pilot jets, no good
Saw that the hoseclamp to airbox, doesnt work perfect. threads locks before you get a tif fit.

Could it be cdi unit ?
Anyone tried the old cdi to the new bike ?


I have to ask the obvious. If the 20 runs good and the 22 bogs, what happens when you swap the carbs between the bikes? Does the "good carb" fix the 22? Does the "bad carb" make the 20 bog? Troubleshooting is fairly easy when you have 2 bikes right there side by side to work the process of elimination.

For the hose clamps, they get sticky and rickety. I put a few drops of graphite lube on the threads to keep them moving smooth.
Dirtdemon 5/4/2022 10:07am
5/4/2022 10:07am
digger wrote:
I see that you're trying to jet a 22' KTM/Husky model 125. I spent 2 days working on 2 different bikes trying to get them to...
I see that you're trying to jet a 22' KTM/Husky model 125. I spent 2 days working on 2 different bikes trying to get them to jet cleanly, or to atleast get them to a point that I thought was acceptable, I never achieved that. I also had 19' and 20'(125's) bikes there as well, and they would do exactly as I would expect them to do jetting wise. But those 22's, I was never able to get that bog that you are describing out of them, and I tried everything. I had my hands on everything in those carbs and nothing I changed made much of a difference. It was super frustrating. I even had him try a 38mm Keihin PWK at one point with a jetting setup that was super rich and It still bogged off the bottom. There is something wrong with those bikes that's not right. I'm not sure if it's a power valve or an ignition/electrical issue, but something isn't right. The one thing we did take away from it though, is that the red power valve spring from the 250/300's makes the bike much more responsive off the bottom.
Dirtdemon wrote:
I have a 20 and a 22. Having the problem with bog from idle with the 22 bike. I rebuilt the crank on the new bike...
I have a 20 and a 22.
Having the problem with bog from idle with the 22 bike.
I rebuilt the crank on the new bike at 1.5 hours. Safety for my son. So crank is not the fault.

tried different pilot jets, no good
Saw that the hoseclamp to airbox, doesnt work perfect. threads locks before you get a tif fit.

Could it be cdi unit ?
Anyone tried the old cdi to the new bike ?


gahooligan wrote:
Did you try the jetting that I listed above that worked for me on the 22and set a bit higher idle? Mine does not bog anymore.
Tried your spec except for throttle (5)
Bike don’t bog quick throttle , as almost all in.
Bike runs crap on idle
If I set as perfect clean idle it bogs
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AJ565 5/4/2022 10:44am
5/4/2022 10:44am
Mattshredsgnar wrote:
I feel like people are overthinking stuff. I didn’t notch my slide I didn’t do anything crazy and my bike runs perfect now. It’s a 19...
I feel like people are overthinking stuff. I didn’t notch my slide I didn’t do anything crazy and my bike runs perfect now. It’s a 19 250sx. It’s 42-71 needle/ 440 main/32.5 pilot/450 main when it’s really cold. No bog. Don’t buy JDJETTING
You’d really need to ride one with the different slide to see what you’re missing. It’s an overall better package and not a bog we were chasing.
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AJ565 5/4/2022 10:45am
5/4/2022 10:45am
Dirtdemon wrote:
I have a 20 and a 22. Having the problem with bog from idle with the 22 bike. I rebuilt the crank on the new bike...
I have a 20 and a 22.
Having the problem with bog from idle with the 22 bike.
I rebuilt the crank on the new bike at 1.5 hours. Safety for my son. So crank is not the fault.

tried different pilot jets, no good
Saw that the hoseclamp to airbox, doesnt work perfect. threads locks before you get a tif fit.

Could it be cdi unit ?
Anyone tried the old cdi to the new bike ?


FGR01 wrote:
I have to ask the obvious. If the 20 runs good and the 22 bogs, what happens when you swap the carbs between the bikes? Does...
I have to ask the obvious. If the 20 runs good and the 22 bogs, what happens when you swap the carbs between the bikes? Does the "good carb" fix the 22? Does the "bad carb" make the 20 bog? Troubleshooting is fairly easy when you have 2 bikes right there side by side to work the process of elimination.

For the hose clamps, they get sticky and rickety. I put a few drops of graphite lube on the threads to keep them moving smooth.
I’m pretty sure digger said they swapped known good carbs and it still did it.
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FGR01 5/4/2022 10:56am
5/4/2022 10:56am
Dirtdemon wrote:
I have a 20 and a 22. Having the problem with bog from idle with the 22 bike. I rebuilt the crank on the new bike...
I have a 20 and a 22.
Having the problem with bog from idle with the 22 bike.
I rebuilt the crank on the new bike at 1.5 hours. Safety for my son. So crank is not the fault.

tried different pilot jets, no good
Saw that the hoseclamp to airbox, doesnt work perfect. threads locks before you get a tif fit.

Could it be cdi unit ?
Anyone tried the old cdi to the new bike ?


FGR01 wrote:
I have to ask the obvious. If the 20 runs good and the 22 bogs, what happens when you swap the carbs between the bikes? Does...
I have to ask the obvious. If the 20 runs good and the 22 bogs, what happens when you swap the carbs between the bikes? Does the "good carb" fix the 22? Does the "bad carb" make the 20 bog? Troubleshooting is fairly easy when you have 2 bikes right there side by side to work the process of elimination.

For the hose clamps, they get sticky and rickety. I put a few drops of graphite lube on the threads to keep them moving smooth.
AJ565 wrote:
I’m pretty sure digger said they swapped known good carbs and it still did it.
Digger tried a Keihin with reasonable/rich settings that "should" have cured the problem.

I'd like to hear Dirtdemon do a direct swap from a known good bike to a problem 2022 in a direct, back-to-back fashion to put some sense to this 2022 issue.

Pit Row

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Dirtdemon 5/4/2022 12:14pm
5/4/2022 12:14pm
the swap worked !!!!
No bog, runs like the old 2020.

It was 8,5 hours since I ate lunch.. so I forgot to check float height of the two carbs. Maybe the key to all this

Both have JD jetting o-ring and gasket.

Do Mikuni have two production plants ??




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gahooligan 5/4/2022 12:34pm
5/4/2022 12:34pm
Dirtdemon wrote:
I have a 20 and a 22. Having the problem with bog from idle with the 22 bike. I rebuilt the crank on the new bike...
I have a 20 and a 22.
Having the problem with bog from idle with the 22 bike.
I rebuilt the crank on the new bike at 1.5 hours. Safety for my son. So crank is not the fault.

tried different pilot jets, no good
Saw that the hoseclamp to airbox, doesnt work perfect. threads locks before you get a tif fit.

Could it be cdi unit ?
Anyone tried the old cdi to the new bike ?


gahooligan wrote:
Did you try the jetting that I listed above that worked for me on the 22and set a bit higher idle? Mine does not bog anymore.
Dirtdemon wrote:
Tried your spec except for throttle (5) Bike don’t bog quick throttle , as almost all in. Bike runs crap on idle If I set as...
Tried your spec except for throttle (5)
Bike don’t bog quick throttle , as almost all in.
Bike runs crap on idle
If I set as perfect clean idle it bogs
Mine idles fine and will idle fine unattended for extended periods. No bog on the stand or riding. Its getting in the 80s here so well see how it goes and if I need to move back to the leaner slide and jetting for summer. I doubt it though.
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gahooligan 5/4/2022 12:38pm
5/4/2022 12:38pm
Dirtdemon wrote:
the swap worked !!!! No bog, runs like the old 2020. It was 8,5 hours since I ate lunch.. so I forgot to check float height...
the swap worked !!!!
No bog, runs like the old 2020.

It was 8,5 hours since I ate lunch.. so I forgot to check float height of the two carbs. Maybe the key to all this

Both have JD jetting o-ring and gasket.

Do Mikuni have two production plants ??




That is awesome news!! Thanks for trying that and sharing your results.
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FGR01 5/4/2022 1:08pm
5/4/2022 1:08pm
Dirtdemon wrote:
the swap worked !!!! No bog, runs like the old 2020. It was 8,5 hours since I ate lunch.. so I forgot to check float height...
the swap worked !!!!
No bog, runs like the old 2020.

It was 8,5 hours since I ate lunch.. so I forgot to check float height of the two carbs. Maybe the key to all this

Both have JD jetting o-ring and gasket.

Do Mikuni have two production plants ??




Excellent.

So, this one case would seem to suggest there is something going on in the 2022 carb. They changed the carb design? They had a bad batch production run, poor quality control?

In addition to checking/comparing the float heights, I'd also do a good side-by-side visual inspection. See if there is anything noticeably different in the carbs.
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jcp411 5/4/2022 2:42pm
5/4/2022 2:42pm
This is so odd!! So possibly a carb problem now….
At least we know it’s not crank related which is good news!
Dirtdemon 5/5/2022 12:43am
5/5/2022 12:43am
1)
Ultrasonic cleaner ?
Bad gas from factory ?

2)
cast problems ?

3) float height ?


4) ?
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jcp411 5/5/2022 10:17am
5/5/2022 10:17am
Dirtdemon wrote:
1)
Ultrasonic cleaner ?
Bad gas from factory ?

2)
cast problems ?

3) float height ?


4) ?
Anyway you could compare the carbs? There’s gotta be something different between the two.
Dirtdemon 5/6/2022 2:22am
5/6/2022 2:22am
Dirtdemon wrote:
1)
Ultrasonic cleaner ?
Bad gas from factory ?

2)
cast problems ?

3) float height ?


4) ?
jcp411 wrote:
Anyway you could compare the carbs? There’s gotta be something different between the two.
New carb bog on the 20 bike after ultrasonic clean
Race this weekend so don’t have time to compare them off the bikes
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jcp411 5/6/2022 7:58am
5/6/2022 7:58am
Last night i took the carb off the bike and took it completely apart, blew out every hole in that carb with compressed air. Changed the pilot to a 35 still has a slight bog off idle but nothing like it was before and runs so dam good.
#5 slide no notch
All the other jetting is the same as on the first page that digger wrote up.
Mattshredsgnar 5/6/2022 11:35am
5/6/2022 11:35am
jcp411 wrote:
Last night i took the carb off the bike and took it completely apart, blew out every hole in that carb with compressed air. Changed the...
Last night i took the carb off the bike and took it completely apart, blew out every hole in that carb with compressed air. Changed the pilot to a 35 still has a slight bog off idle but nothing like it was before and runs so dam good.
#5 slide no notch
All the other jetting is the same as on the first page that digger wrote up.
Try a 32.5 pilot.
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jcp411 5/6/2022 11:57am
5/6/2022 11:57am
jcp411 wrote:
Last night i took the carb off the bike and took it completely apart, blew out every hole in that carb with compressed air. Changed the...
Last night i took the carb off the bike and took it completely apart, blew out every hole in that carb with compressed air. Changed the pilot to a 35 still has a slight bog off idle but nothing like it was before and runs so dam good.
#5 slide no notch
All the other jetting is the same as on the first page that digger wrote up.
Mattshredsgnar wrote:
Try a 32.5 pilot.
That’s what was in it and bogged pretty bad, the 35 actually helped a good bit.
Tuplavee
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Tuplavee 5/9/2022 2:46am
5/9/2022 2:46am
Recommended sea level jetting for temperatures 10-25 Celsius (50-75F) ?
Novice level mx and sometimes single track.

TC250 2017
Stock slide, stock needle jet.
Currently 440 MJ, 42,5 PJ, 6BFY43-73 - 2nd from top.

I did look for 5.0-5.75 slides and S4 needle jet+needle and jets.. but seems costly if not 100% sure how it work

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