17 TC 125 cutting out

digger
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digger 6/13/2019 5:26am
6/13/2019 5:26am
Dev_1leg wrote:
470 main 35 pilot clip 3 ran ok till it got colder with in 3 miles acted up did weird stuff, Did the Jarvis mods such...
470 main 35 pilot clip 3 ran ok till it got colder with in 3 miles acted up did weird stuff, Did the Jarvis mods such as crimped bent overflow notched the slide and dropped the clip to needle position 1 bike runs even more terrible I did pinch the gasket on the top of the carb in half so maybe that’s why 😡 I cut the slide and opened the hole on the slosh guard a size bigger changed the pilot to a 30 didn’t get to ride it because the pinched the gasket this issue is really making mad.. bike will stay running with the choke on but soon as I turn the choke off and touch the throttle it bogs but it sometimes will burst through the power band and then bog again. (Pic is your slide I just circled what I notched
All you did there was make the pilot jet circuit more efficient, which in turn should make the bike idle better. It is critical that those bike use a minimum of an S-4 needle jet along with a leaner 5.0 slide. The jetting for that bike in upstate NY should be right around. Some of the Jarvis mods are feel good mods and don't add anything useful, but don't hurt performance either.

Needle: 42-74 in the 3rd clip position

Pilot: 32.5 pilot, with an unnotched slide, and a 30 with a notched slide. I wouldn't be afraid to open up that notch on the slide you pictured above a little more.

Main: 490

S-4 jet needle jet---this is critical

Slide: #5 you can either cut yours or purchase one from JD jetting.

Set the air screw at 1.5 turns out to startout with.
Dev_1leg
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Dev_1leg 6/13/2019 6:43am
6/13/2019 6:43am
Digger I have a 42-75 needle in it now, I just order a 42-74 needle and a S-4 needle jet from KTM dealer that’s closest along with a carb gasket kit from my own error next week they said it’ll be in since it’s Thursday now. Fingers crossed
BR8ES
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BR8ES 6/13/2019 7:19am
6/13/2019 7:19am
dtl210 wrote:
Not sure what's going on with your bike, but a couple things to check out - These bikes like to stay warm. You might try blocking...
Not sure what's going on with your bike, but a couple things to check out

- These bikes like to stay warm. You might try blocking a radiator off a little bit to keep the temps up in the 120-130 range where the bike seems happy.

- Research the "Jarvis" mods. There are situations where the float bowl can actually run out of fuel after long pulls, these mods help fuel get into the main jet cavity quicker.

- If these issues just started, it's possible your top end is wearing out. A compression check never hurts.


On mine it was ok but still super finiky after doing everything described in this thread. I did the Jarvis mods and put in a JD jet kit. I haven't had to touch the carb since.
Dev_1leg wrote:
I would like to just get a 36mm Smart carb sc2 and really really be done with it,

https://technologyelevated.com/product/36mm-sc2-smartcarb/
I have one on my 19 TC125, works very well.
digger
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digger 6/13/2019 7:25am
6/13/2019 7:25am Edited Date/Time 6/13/2019 7:32am
I didn't notice in your previous posts if you had also replaced the jet block gasket. If not please do so. Some Mikunis came through with bad jet block gaskets from the factory, which will cause the bike to run rich all the time.

If you're not going to cut the slide into a #5, or replace with a #5 slide, none of what I posted above will work. It needs to be done in tandem with one another. It's not a piece meal setup to be done one at a time.

How far away from Edelman's KTM are you ? I believe they have all of what you need in stock, with the exception of the slide.

https://jdjetting.com/product/jdmk05-mikuni-tmx-jet-block-kit/

https://jdjetting.com/product/jdmk02-mikuni-tmx-ktm-husq-carburetor-sli…
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Dev_1leg
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Dev_1leg 6/13/2019 9:40am
6/13/2019 9:40am
digger wrote:
I didn't notice in your previous posts if you had also replaced the jet block gasket. If not please do so. Some Mikunis came through with...
I didn't notice in your previous posts if you had also replaced the jet block gasket. If not please do so. Some Mikunis came through with bad jet block gaskets from the factory, which will cause the bike to run rich all the time.

If you're not going to cut the slide into a #5, or replace with a #5 slide, none of what I posted above will work. It needs to be done in tandem with one another. It's not a piece meal setup to be done one at a time.

How far away from Edelman's KTM are you ? I believe they have all of what you need in stock, with the exception of the slide.

https://jdjetting.com/product/jdmk05-mikuni-tmx-jet-block-kit/

https://jdjetting.com/product/jdmk02-mikuni-tmx-ktm-husq-carburetor-sli…
Let me check and get back with you thank you in the mean time. Side note what top would you recommend I’m thinking a vertex dual ring. When 100hra hits I wanna do new crank and a factory 150 kit
BR8ES
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BR8ES 6/13/2019 9:44am
6/13/2019 9:44am Edited Date/Time 6/13/2019 9:49am
Edit, you already did the mods. Sorry. The JD kit is worth the investment of time and money, but I sure don't regret going SC2.
Tracktor
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Tracktor 6/13/2019 11:25am
6/13/2019 11:25am
From my experience the easiest thing to do is just put a 38mm PWK Air Stryker on it. I am getting into 125 set up on our '17 and just bolting that on made it a completely different bike. Worth every penny..........
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Dev_1leg
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Dev_1leg 6/13/2019 11:42am
6/13/2019 11:42am
Digger I’m about a hour an 10 mins away I was just there the other day I’m waiting on a call back if they have it I’m gonna cancel my order with progressive motor sports on RT.4 they told me next week I’d rather not wait haha
Dev_1leg
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Dev_1leg 6/15/2019 5:39am
6/15/2019 5:39am


How’s this look? I used a 7/32 file still waiting on S4 and new 42-74
BR8ES
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BR8ES 6/15/2019 7:17am
6/15/2019 7:17am
Dev_1leg wrote:
[img]https://p.vitalmx.com/photos/forums/2019/06/15/354597/s1200_image.jpg[/img] How’s this look? I used a 7/32 file still waiting on S4 and new 42-74


How’s this look? I used a 7/32 file still waiting on S4 and new 42-74
The back notch is ok, don't go any bigger. Hard to tell with the cutout. Did you drill the float bowl plug too?
Dev_1leg
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Dev_1leg 6/15/2019 8:38am
6/15/2019 8:38am
Had to turn the idle way down also I went a little bit more on the slide it looks good, I also changed the main jet to a 470 which I’m gonna change to a 480

digger
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digger 6/15/2019 10:28am
6/15/2019 10:28am Edited Date/Time 6/15/2019 10:32am
Dev_1leg wrote:
[img]https://p.vitalmx.com/photos/forums/2019/06/15/354597/s1200_image.jpg[/img] How’s this look? I used a 7/32 file still waiting on S4 and new 42-74


How’s this look? I used a 7/32 file still waiting on S4 and new 42-74
The front notch looks better. I can’t tell if you cut the the back side at all. I never saw any benefit to drilling the float bowl plug.

Here’s a stock #4 slide that recently cut into a #5.5.

BR8ES
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BR8ES 6/15/2019 10:58am
6/15/2019 10:58am Edited Date/Time 6/15/2019 10:58am
Looks like you have it set up well, once you get the waiting on parts, should rip. My Mikuni went pretty well with all the mods, etc.
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Dev_1leg
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Dev_1leg 6/15/2019 2:44pm
6/15/2019 2:44pm


Is this the part you cut down? I only ran a file through the notch on my slide that’s it
digger
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digger 6/15/2019 3:38pm
6/15/2019 3:38pm Edited Date/Time 6/15/2019 3:40pm
Dev_1leg wrote:
[img]https://p.vitalmx.com/photos/forums/2019/06/15/354725/s1200_6C00B7DF_DEF9_476F_81F2_3562D6274615.jpg[/img] Is this the part you cut down? I only ran a file through the notch on my slide that’s it


Is this the part you cut down? I only ran a file through the notch on my slide that’s it
Yes, I made it 1.5mm deeper and wider, and tapered it into the main cut.

Your slide will only need to be cut 1mm for 125's and 150's.
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dtl210
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dtl210 6/21/2019 7:49pm
6/21/2019 7:49pm Edited Date/Time 6/21/2019 7:49pm
Dev_1leg wrote:
[img]https://p.vitalmx.com/photos/forums/2019/06/21/356009/s1200_BE14A0E3_65C6_4164_89EF_9D7C62B5B850.jpg[/img]

I feel your pain. Have you done a compression test? How did the jet block gasket look?

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Dev_1leg
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Dev_1leg 6/21/2019 9:07pm
6/21/2019 9:07pm
Dev_1leg wrote:
[img]https://p.vitalmx.com/photos/forums/2019/06/21/356009/s1200_BE14A0E3_65C6_4164_89EF_9D7C62B5B850.jpg[/img]

dtl210 wrote:
I feel your pain. Have you done a compression test? How did the jet block gasket look?
Changed the jet block gasket with a jd kit also go a genuine #5 slide, 42-74 Needle clip 1 and a s-4 needle jet, 1.5 aso 470main 30 pilot is what I put it in the garage with. Ran clip 2 ran 480main and 32.5 pilot. no good, I didn’t do a compression test yet the bike will still hit when it wants though. I wanna cry RN this is nuts I have 11k including the bike into this and the shit doesn’t wanna run proper 😓😓😓
digger
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digger 6/21/2019 9:18pm
6/21/2019 9:18pm
What's no go about it ? Bog or stutter, what rpm range ?
Dev_1leg
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Dev_1leg 6/21/2019 9:36pm
6/21/2019 9:36pm
It Boggs 1/4 throttle and it had bogged in the top end after a short pull not even topped out imm gonna post a video tomorrow see what y’all think if it keeps on running like trash I’m going to get the sc2 smart carb ASAP
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Dev_1leg 6/23/2019 12:45pm
6/23/2019 12:45pm
digger wrote:
What's no go about it ? Bog or stutter, what rpm range ?
I’m tryna upload a video to the page but it’s right around 1/8 1/4 throttle pilot 30 main 480 I think clip 1 and 1 1/2 turns out. I DIDNT notch the new #5 slide on the little U shape, could this be the reason I don’t remember anybody saying to notch the #5
digger
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digger 6/23/2019 3:43pm
6/23/2019 3:43pm
Have you tried moving the clip down to the 2nd or 3rd clip position? Probably going to need a bigger pilot than a 30 as well with the non notched slide. The main seems fine.
Dev_1leg
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Dev_1leg 6/24/2019 6:12am
6/24/2019 6:12am
digger wrote:
Have you tried moving the clip down to the 2nd or 3rd clip position? Probably going to need a bigger pilot than a 30 as well...
Have you tried moving the clip down to the 2nd or 3rd clip position? Probably going to need a bigger pilot than a 30 as well with the non notched slide. The main seems fine.
Coming off WOT it seems to wanna bog out i notched the slide and it was better but still would wanna die I think I’m gonna try clip 3, then a 32.5
riv187
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riv187 6/24/2019 6:58am
6/24/2019 6:58am
I posted the first pictures of how I cut my slide,,,I also run the clip at top,,stock pilot jet,I think 32.5 in the 18 model, and have 460-500 main jets. I have a adjustable power jet built into back of carb to tune the top end. Another tuning tool is tightening the Power valve. 2 1/2 - 2 3/4 in works with my pipe silencer and head changes. I tried only 2 turns in and it bogged some when launching off line and when landing after it had been screaming in the air.
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dtl210 6/24/2019 11:46am
6/24/2019 11:46am
Not sure if it's been discussed on your bike or not, but is you powervalve sticking?
Dev_1leg
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Dev_1leg 6/24/2019 7:43pm
6/24/2019 7:43pm
BR8ES wrote:
Edit, you already did the mods. Sorry. The JD kit is worth the investment of time and money, but I sure don't regret going SC2.
Do you still run the sc2?
2stmark
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2stmark 6/30/2019 7:08am
6/30/2019 7:08am
as dtl210 said ...make sure your powervalve isn't sticking
my 16 150sx had this problem & it is somewhat common
Dev_1leg
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Dev_1leg 6/30/2019 7:03pm
6/30/2019 7:03pm
2stmark wrote:
as dtl210 said ...make sure your powervalve isn't sticking
my 16 150sx had this problem & it is somewhat common
The spark plug ground electrode is white i gotta just make it as rich as can be and see what happens, current situation is had to cut the throttle cable to get the plastic retaining ring around from the aluminum screw in piece that goes into the slide and what the throttle cable pics up on. So ordered throttle cable plastic retainer and aluminum screw soon as I do that I can sell the carb hahahahaha, but I’ll try to tune it some more then going kiehin with stik

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