Upgrade to enjoy this feature!
Vital MX fantasy is free to play, but Premium users receive great benefits. Premium benefits include:
- View and download rider stats
- Pick trends
- Create a private league
- And more!
Only $10 for all 2026 SX, MX, and SMX series.
Thank you. I’ll shop around for a ccm needle.
Defo throw the NOZI in the bin. That needle ran all the stock KTM's rich in the first .25 throttle. An old Sudco DDK filled in the bottom with bark on my 200. Pulled with tractor factor as well.
Sorry Rat for the late reply
Elevation is basically sea level in Australia.
Temp ranges from 45degF - 95degF. Throw in a bit of humidity.
I varied 1 size leaner (pilot & main) for summer and maybe went 1 size richer (pilot & main) for colder days.
The N3CG Needle is from the 250. Bike was always crisp and never suffered any bogging.
Thanks for your reply how would you change that setting for 5000' and 80 f ?
Im thinking 55 Pilot
N3CG needle 2nd clip
160 Main
Stock powerjet
The Shop
Luxon 4-Post Bar Mounts
$189.95 - $239.95
Free shipping: VITALMX
I just got everything in. 175 main 45 pilot, nozi clip 3, and a 6 slide might be a 6.5 I'm not sure lol. i just rode it up and down the neighborhood real quick and it feels like it revs up really quick on the stand. I'm not sure if it because everything is too lean or I have the wrong slide. after 5 mins of run time the plug looks pretty good black but not wet and its starting to get brown I think. but help would be appreciated.
The slide will have the number on the bottom, make sure it is a #6 and not 6.5. Those settings Digger provided likely will not work with a 6.5
it says 65 not 6.5. but the bottom end seemed to work fine.
Thanks for your Specs.
Ended with N3CG needle 3rd clip
60 Pilot
160 Main
1 1/4 turns out on air screw
Stock powerjet
Eliminated a bog right off the crack of the throttle.
Are you running 40:1?
Valero 93 octane 40:1 with motul 710
Digger, I purchased a 5.5 slide, but cannot find a CCL needle anywhere or any of the needles you listed. Is there any other options? I’m at 50ft above sea level and I’m running a 55 pilot, the air screw is about .75 out and a 172 main but I only have the jd red and blue needle and the stock NYEF needle. The jd red needle in the 4th clip seemed to help the low end bog a bit but it’s still there. Haven’t put in the 5.5 slide yet because I can’t find a needle to use.
On rockeymountain atv I found the nozi under ktm125 oem parts. I can’t remember what year though. Also where did you find the 5.5 slide?
I’ll have to look for the nozi needle again but I found the slide on eBay. Here’s the link
https://www.ebay.com/itm/126672935461
2023 YZ125 - Jetting Fix
Can't figure out how to save this thread to my account, so am just replying to save it.
2024 yz125 stock jetting 2hrs what went wrong the bike ran great?![]()
Winter arrived?
That's my best guess until you give us a lot more info. How many hours? Fresh top end? Did anything change? Did you switch fuel, oil, and/or ratio?
Brand new bike has 3 hrs on it. Never been opened up. 160 main nydf needle on second clip and a 75 pilot. Plug electrode melted off and melted the piston.
That is an obvious severe lean/overheat/detonation example there. What fuel, oil, and ratio were you using? What was the temperature when riding? Do you have a good coat of oil on the air filter? Was the bike being ridden on an MX track or wide open on the streets?
Could be a bad air leak somewhere. Possible one of the crank seals was not installed correctly at the factory or the reed block or cylinder base gasket are leaking.
Pit Row
93 mixed with dominator 40:1. Only rode on a Mx track. It was 65 degrees in Jersey yesterday we unloaded fired right up made one lap and it melted down and shut off. Basically a brand new 3 hrs total run time. The plug didn’t show any signs until it was too late…
If only 3 hrs, I'd take it back to the dealer.
Were You at sea level? Was it the stock plug?
YZ125”X” jetting update below:
Since racing season is over, I decided to do more testing with my 2024 YZ125X and see if I could improve on the JD Jetting spec. Long story short, thanks to a lot of help from Digger, I arrived at a jetting spec that is no doubt better than the JD Jetting and anything else I have tried. That jetting spec is a custom 5.65 slide, N3CW (yz250 needle) in 3rd clip, 185 main, 55 pilot, AS 1.5 out. This jetting spec in 60 to 80 degree weather at sea level works amazing. If you are not happy with your current YZ125X jetting spec, this could be something you want to try and pursue. But be warned, going down this road will likely lead to alot of frustration, a month of testing, and a pile of needles that you will likely never use. In the end, it was worth it for me.
More info below:
I tried many different types of needles including CCL, CCM, CCN, CEN, DCN, N3EW, N3CW, and a few others. At one point I actually purchased a # 7 slide from the YZ125 and tried getting tye GYTR Y3 needle to work like it did in my YZ125. Throughout this month of testing I found many different combinations that worked really really good. But most always had some sort of drawback to them. It was hard to get the perfect combination.
I have tested the above jetting spec back to back with the JD Jetting spec (with 6.5 slide) and I can say without a doubt the 5.65 slide and N3CW needle work better.
Hopefully this helps someone get closer to that perfectly tuned YZ125X.
YZ125X Jetting spec below:
185 Main
55 Pilot
5.65 slide (custom made from a 5.0 slide)
N3CW needle in 3rd clip
AS 1.25 to 1.5 out
Temps - 50 to 80
Elevation - Sea Level
Fuel - Avgas mixed 50/50 with 93 pump
Premix - Bel Ray H1R at 32/1
Intermediate level MX riding
Last thing I wanted to mention is that the Digger spec, the above spec, JD Spec, etc, will likely not be a plug and play that will work for your bike and your riding conditions. These specs will get you close, but you will most likely need to work through some tuning for your specific area of the country and riding style.
***ATTENTION - SEE QUOTED POST***
ALL THE PARTS FOR THE DIGGER SETTING ARE CURRENTLY IN STOCK AND AVAILABLE!
The #6 slide and cable holder are in stock at “JD jetting” and the CCL needle is in stock at “Jets R Us”. Just letting everyone know.
Did you happen to try the N3CW with another slide? Currently running the CCL with a #6 slide and wondering if it is worth testing.
I only tried the N3CW needle with the 5.65 slide. This is what Digger recommended to me. If your bike runs great with the CCL needle, I would not experiment with the N3CW.
I just ordered the #6 slide to test with the CCL needle. I will do back to back testing with the 5.65 slide and N3CW needle. I’ll post up my thoughts once I get some testing done.
I'm curious how the 6.0 slide and CCL needle works. I just dropped that into my bike since I'm currently greasing all the bearings. I wont be riding again till spring though. Spent all year on the JD jetting kit and it worked good 50-90 degrees. Certainly could be better in some areas.
It's very good. I had this setup with the CCL in the #4 clip position, a 55 pilot and 182 main in the fall.
Do you think CCL needle and 6.0 slide will work between 30-75F sea level?
Edit: Or maybe 5.5 slide with CCM needle would be better intermediate to start with?
I was able to do back to back to back to back testing today with the (#5.65 slide N3CW-3) and the (#6 slide CCL-3). In my opinion, the 5.65 slide and the N3CW-3 work a little better for overall performance. The engine runs slightly cleaner and more efficient with no gaps in the power. They are VERY CLOSE in performance, and this really is splitting hairs. I did not change the pilot or main with this test, just the needles and slides.
After a ton of testing and note taking, I have finally arrived at a setting that makes this bike (2024 YZ125X) run like it should have straight off the showroom floor. THANK YOU DIGGER for leading us down a good path with this bike!
Updated setting posted below for the YZ125X…
185 Main
55 Pilot
5.65 slide (custom made from a 5.0 slide)
N3CW needle in 3rd clip
AS 1.25 to 1.5 out
Temps - 50 to 80 degrees
Elevation - Sea Level
Fuel - Avgas mixed 50/50 with 93 pump
Premix - Bel Ray H1R at 32/1
Intermediate level MX
Post a reply to: 2023 YZ125 - Jetting Fix