2017 TC250 New to me

Cojack585r
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Cojack585r
I just purchased a 2017 TC 250 with 4.4hrs on it, went for a test ride and it felt like a crf100. I pulled the carb and it has a 42.5 pilot 430 main stock clip middle position. It would just not clear out and get into the power. I would like to ride this weekend if i can get the jetting a bit more dialed in. I have read about the jetting woes of the tmx carb but at this time it is what I have to work with. I'm in eastern NC and its 98 deg at the moment. Any jetting suggestions would be much appreciated.
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Cojack585r
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Cojack585r 5/29/2019 8:33am
5/29/2019 8:33am
yes, 3 looked good one had a very small gap in it
seth505
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seth505 5/29/2019 8:51am
5/29/2019 8:51am
Only 4 hours in a 2017, maybe pull apart the carb and ensure all the jets are actually open and not clogged. On my 250sx I'm running a 460 main and 35 pilot but it's not that hot here yet. Also, check the power valve setting/spring.
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Cojack585r
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Cojack585r 5/29/2019 9:08am
5/29/2019 9:08am
seth505 wrote:
Only 4 hours in a 2017, maybe pull apart the carb and ensure all the jets are actually open and not clogged. On my 250sx I'm...
Only 4 hours in a 2017, maybe pull apart the carb and ensure all the jets are actually open and not clogged. On my 250sx I'm running a 460 main and 35 pilot but it's not that hot here yet. Also, check the power valve setting/spring.
I am new to the KTM/Husky bikes so I apologize a head of time for all the newb questions. I have combed the forums the past week reading about all the jetting issues and what not. I'm going to drop pilot jet size this evening and lean the needle out some to see if that helps.

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jpatz319
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jpatz319 5/29/2019 1:20pm
5/29/2019 1:20pm
I agree with jeffro on AJ's specs. I live in the Charlotte area and run his specs on a '17 KTM. It made a night and day difference with how the bike runs.

Here are AJ's specs that I am running

MJ 470
PJ 32.5
Slide 5.75 (comes from a 04 KX125)
Needle 42-75 (KTM optional part)
Needle Clip 3rd pos.
AS 1.5 or 2.0
60:1 motorex using VP C12
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RCF
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RCF 5/29/2019 1:52pm
5/29/2019 1:52pm
I would make sure the power valve is actually working pop one the covers off and make sure it's moving. Then I would toss that Mikuni and get a keihin carburetor for it save yourself a bunch of headaches.
erik_94COBRA
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erik_94COBRA 5/29/2019 3:13pm
5/29/2019 3:13pm
RCF wrote:
I would make sure the power valve is actually working pop one the covers off and make sure it's moving. Then I would toss that Mikuni...
I would make sure the power valve is actually working pop one the covers off and make sure it's moving. Then I would toss that Mikuni and get a keihin carburetor for it save yourself a bunch of headaches.
I would also check this. Had one screw on PV mechanism back out jamming PV in closed position. Felt like an XR200.
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Cojack585r
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Cojack585r 5/29/2019 3:33pm
5/29/2019 3:33pm
RCF wrote:
I would make sure the power valve is actually working pop one the covers off and make sure it's moving. Then I would toss that Mikuni...
I would make sure the power valve is actually working pop one the covers off and make sure it's moving. Then I would toss that Mikuni and get a keihin carburetor for it save yourself a bunch of headaches.
erik_94COBRA wrote:
I would also check this. Had one screw on PV mechanism back out jamming PV in closed position. Felt like an XR200.
That will be the first thing I check when I get home this evening. Makes sense bc that is exactly what it felt like. Local dealership didnt have any smaller pilots so I ordered the JD jet kit, going to mess with it more tonight. I am hoping to at least be able to ride Sunday afternoon.
rollin64caddy 5/29/2019 3:41pm
5/29/2019 3:41pm
Look into the long bolt idler gear mod for these. There is a thread in the tech section. Its easy and worth the piece of mind.
Cojack585r
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Cojack585r 5/29/2019 5:04pm
5/29/2019 5:04pm
Pulled both sides of the PV covers and no bolts are loose. Not really sure how to move it around as I’m new to pv’s. It has the yellow spring and I set at 2 turns in, going to try with the needle leaned out some and see what happens. JD jet kit should be here Friday
RCF
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RCF 5/29/2019 5:27pm
5/29/2019 5:27pm Edited Date/Time 5/29/2019 5:29pm
Cojack585r wrote:
Pulled both sides of the PV covers and no bolts are loose. Not really sure how to move it around as I’m new to pv’s. It...
Pulled both sides of the PV covers and no bolts are loose. Not really sure how to move it around as I’m new to pv’s. It has the yellow spring and I set at 2 turns in, going to try with the needle leaned out some and see what happens. JD jet kit should be here Friday
Just start the bike up and Rev the engine, or just pop the arm off the power-valve and move it with your fingers.
Cojack585r
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Cojack585r 5/29/2019 5:37pm
5/29/2019 5:37pm Edited Date/Time 5/29/2019 5:39pm
Leaning out the needle seemed to help quite a bit, also went to a 450 main which was the biggest I had
Mx 117
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Mx 117 5/30/2019 7:26am
5/30/2019 7:26am Edited Date/Time 5/30/2019 7:38am
The issue has more to do with the slide. Once you have the fixed, you will be able to jet it correctly. Had the same issue when I bought my '17
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Bramlett321
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Bramlett321 5/30/2019 7:33am
5/30/2019 7:33am
RCF wrote:
I would make sure the power valve is actually working pop one the covers off and make sure it's moving. Then I would toss that Mikuni...
I would make sure the power valve is actually working pop one the covers off and make sure it's moving. Then I would toss that Mikuni and get a keihin carburetor for it save yourself a bunch of headaches.
erik_94COBRA wrote:
I would also check this. Had one screw on PV mechanism back out jamming PV in closed position. Felt like an XR200.
Cojack585r wrote:
That will be the first thing I check when I get home this evening. Makes sense bc that is exactly what it felt like. Local dealership...
That will be the first thing I check when I get home this evening. Makes sense bc that is exactly what it felt like. Local dealership didnt have any smaller pilots so I ordered the JD jet kit, going to mess with it more tonight. I am hoping to at least be able to ride Sunday afternoon.
Do this right here^^^^, I had the same issue with a 300 and was like wtf this is not right. Even if your jetting was that far off it would eventually pull strong on top. But with yours doing what it is, has to be PV related.
Cojack585r
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Cojack585r 5/30/2019 7:43am
5/30/2019 7:43am
erik_94COBRA wrote:
I would also check this. Had one screw on PV mechanism back out jamming PV in closed position. Felt like an XR200.
Cojack585r wrote:
That will be the first thing I check when I get home this evening. Makes sense bc that is exactly what it felt like. Local dealership...
That will be the first thing I check when I get home this evening. Makes sense bc that is exactly what it felt like. Local dealership didnt have any smaller pilots so I ordered the JD jet kit, going to mess with it more tonight. I am hoping to at least be able to ride Sunday afternoon.
Bramlett321 wrote:
Do this right here^^^^, I had the same issue with a 300 and was like wtf this is not right. Even if your jetting was that...
Do this right here^^^^, I had the same issue with a 300 and was like wtf this is not right. Even if your jetting was that far off it would eventually pull strong on top. But with yours doing what it is, has to be PV related.
Which side did you notice the bold being loose on? I opened both sides and all tq heads were tight
erik_94COBRA
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erik_94COBRA 5/30/2019 7:48am
5/30/2019 7:48am
Mine was on the left (clutch) side of the bike. Could also pull the pipe and see if the PV flap will move freely.

If all that is ok, I would check the float height and reeds. Lots of posts on both of these issues.
jeffro503
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jeffro503 5/30/2019 9:32am
5/30/2019 9:32am
erik_94COBRA wrote:
Mine was on the left (clutch) side of the bike. Could also pull the pipe and see if the PV flap will move freely. If all...
Mine was on the left (clutch) side of the bike. Could also pull the pipe and see if the PV flap will move freely.

If all that is ok, I would check the float height and reeds. Lots of posts on both of these issues.
That's a good point right there too....check those reeds. Seems a lot of them had bad gaps ( my 125 and 250 both were terrible ). You can live with it , but the thing is , quite a few had those reeds break off and go through the motor. I replaced both mine as an insurance policy. I went with a V-force on the 125 , and a Rad valve on the 250.

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AJ565
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AJ565 5/30/2019 9:40am
5/30/2019 9:40am
The JD jet kit is garbage. Its a band aid fix at best and the bike still doesn't run great. If you want it to run like it's supposed to you're going to have to change the slide, needle, and needle jet. Once you get this carb jetted correctly you don't have to mess with it all the time like everyone says you do.
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BR8ES
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BR8ES 5/30/2019 10:56am
5/30/2019 10:56am
Jet block o-ring is probably pinched, you can also mod your slide in 5 minutes, get it close to 5 or 5.5...
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Cojack585r
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Cojack585r 5/30/2019 11:20am
5/30/2019 11:20am
BR8ES wrote:
Jet block o-ring is probably pinched, you can also mod your slide in 5 minutes, get it close to 5 or 5.5...
Ill be pulling the carb off tomorrow to install vforce reeds, can you point me in the direction for this mod.
BR8ES
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BR8ES 5/30/2019 11:54am
5/30/2019 11:54am
BR8ES wrote:
Jet block o-ring is probably pinched, you can also mod your slide in 5 minutes, get it close to 5 or 5.5...
Cojack585r wrote:
Ill be pulling the carb off tomorrow to install vforce reeds, can you point me in the direction for this mod.
Remember, less is more. Can always file a bit further and don't be scared to do this.
BR8ES
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BR8ES 5/30/2019 11:55am
5/30/2019 11:55am Edited Date/Time 5/30/2019 11:56am
And as previously mentioned, do the long bolt mod for the idler gear...may save some headaches
And is easy to do. Make sure you do this.
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HighPlainsSquid 5/30/2019 12:31pm
5/30/2019 12:31pm
jpatz319 wrote:
I agree with jeffro on AJ's specs. I live in the Charlotte area and run his specs on a '17 KTM. It made a night and...
I agree with jeffro on AJ's specs. I live in the Charlotte area and run his specs on a '17 KTM. It made a night and day difference with how the bike runs.

Here are AJ's specs that I am running

MJ 470
PJ 32.5
Slide 5.75 (comes from a 04 KX125)
Needle 42-75 (KTM optional part)
Needle Clip 3rd pos.
AS 1.5 or 2.0
60:1 motorex using VP C12
Interesting about the KX slide. I borrowed the slide from my '04 KX and put it in my KTM and WOW!!!!!! I did the "Jarvis Mods" on my existing KTM slide and that helped, but still not quite like the KX's slide. I should just go ahead and order a new slide and toss it in the KTM.
BR8ES
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BR8ES 5/30/2019 3:50pm
5/30/2019 3:50pm
jpatz319 wrote:
I agree with jeffro on AJ's specs. I live in the Charlotte area and run his specs on a '17 KTM. It made a night and...
I agree with jeffro on AJ's specs. I live in the Charlotte area and run his specs on a '17 KTM. It made a night and day difference with how the bike runs.

Here are AJ's specs that I am running

MJ 470
PJ 32.5
Slide 5.75 (comes from a 04 KX125)
Needle 42-75 (KTM optional part)
Needle Clip 3rd pos.
AS 1.5 or 2.0
60:1 motorex using VP C12
HighPlainsSquid wrote:
Interesting about the KX slide. I borrowed the slide from my '04 KX and put it in my KTM and WOW!!!!!! I did the "Jarvis Mods"...
Interesting about the KX slide. I borrowed the slide from my '04 KX and put it in my KTM and WOW!!!!!! I did the "Jarvis Mods" on my existing KTM slide and that helped, but still not quite like the KX's slide. I should just go ahead and order a new slide and toss it in the KTM.
The Jarvis Mods are way more than just that Squid, worth it to do all of them. Easy enough too, completely transforms the Mikuni.
Cojack585r
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Cojack585r 6/2/2019 6:47pm
6/2/2019 6:47pm
Bike is finally running about like it should, I installed the JD jet kit blue needle 3rd clip, 32.5 pilot and the largest main that came in the kit, fuel screw at recommended setting and it felt better but still not where it should have been so I took the Dremel to the slide and that little bit made all the difference in the world. Im sure my jetting isn't perfect bc it still leaks a little from the silencer, but it is a completely different bike. I'll get to the dyno in the next week or so to see how close I got. Thanks for all the advice.
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