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Only $10 for all 2026 SX, MX, and SMX series.
185 Main
55 Pilot
5.65 slide (custom made from a 5.0 slide)
N3CJ needle in 3rd clip
AS 1.25 to 1.5 out
Temps - 80 to 95 degrees
Elevation - Sea Level
Fuel - Avgas mixed 50/50 with 93 pump
Premix - Bel Ray H1R or Motul 800 at 32/1
I've tested with those NExx series needles in the YZ125. You can get the bike to run really clean with it, but it makes the small bore bikes run different. It removes that hit into the mid and really mellows out the power. They would work really well for a novice rider or someone riding in really gnarly terrain. The bike reacts really well to the clutch, but the power delivery just feels odd for a small bore bike, IMO.
Thanks digger i'm trying to jet the yz 125 as luggable as possible to get My kid woods riding with me he is definetily a begginer and i'm trying to get him to ride real enduro loops with slippery clay some roots and rocks.
For 5000 feet and weather in the 70s what jetting would you start with for the NECJ needle?
I never tried the NECJ, I was using an NECW.
For 5000' and in the 70's:
Needle---NECW in clip #3
Pilot---178/175
Main---50/48
Power jet---35
Slide---5.65
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Thanks!
Does your PC pipe touch the left spring in photo? Stock pipe comes out straight.
I’m not sure, I don’t have my PC exhaust anymore.
Anymore ride updates on the 2026 jetting? Still liking it? Im running the gytr jet kit, bike runs real good just wondering if the 26 jetting would be any better.
No new updates. I have not ridden my YZ125 since the 8/17/25 update I posted on page 7 of this thread. We have a race next weekend where I will be riding my YZ125. I expect it to run just as good as the last race.
Okay, thank you
Has anyone dialed in a #6 slide (or richer) at elevation in summer temps? I just moved to 3000' and my bike runs terribly on the stand with a 52 pilot, #6 slide, CCL-3, 180 main, 35 power jet.
I'm considering just dropping the #7 slide back in and going PC or '26 jetting rather than mess with this setup.
Yep, same. Stock 24 YZ125. “I can still provoke a lean bog with a jab at the throttle.” The stock jetting didn’t do that but it was way too fat down low. I’ve tried many, many variations of jetting, most would have that lean bog down low to one degree or another. Digger’s setting was about the closest to a clean running 125 that I tried. It’s a little fat down low, but doesn’t have that bad lean bog (which was terrible on a few well reviewed settings on here). Obviously 125’s are not known for bottom end power, they’re meant to be ridden in the upper revs and a few setups (Y4 needle stock slide really pulled well) but the lean bog down low (along with a few other recommended setups) made it really hard to ride with any confidence.
Did you try dropping the needle one clip?
I did drop one clip from the setting I used at sea level, haven't tried dropping it again yet though as I removed the carb to check everything over. This was also the first startup on a new top end so it may not be jetting related - it really seemed way off for what should've been a good starting point.
I've ordered the 2026 spec and am going to install it this week, I'm curious if the #7 stock slide will clear it up.
The 2026 USA manual is now available online. The carburetor settings table is listed below. It’s slightly different than the CAN table that was posted earlier in this thread. Looks like the only change is the AS setting for summer time temps.
I was able to race with the 2026 jetting specs again this weekend and it continued to work great. The temperatures and humidity were down so I decided to go with the fall setting instead of the summer setting I had used previously. Temps were 66 to 78 and low humidity.
Before the race, I went from a 172 to 178 main. Also went from 2.5 out on AS to 1.5. I did not have any complaints with the larger main but I did not like the air screw that far in. Throughout practice I made a few adjustments and ended up right back at the 2.5 out AS setting. Bike worked great… no lean bog, no loading up, crispy on the stand, and torquey on the track.
Did you order the new airboot as well?
I didn't. Going with the Rocket setting of old airboot and CDI, and 90 power jet. I already had the GYTR air screw so I just ordered the needle and #90 PJ. Will be starting with a 175 main though as temps are dropping to 70s.
Just an FYI....I tried it (26 jetting - i.e. needle, pilot, main 90 pj & GTYR air screw). For me at least, same old lean bog in the same place. Glad it worked out for others.
Pit Row
That's what I was afraid of. I think I'll stay with the gytr jetting but using the stock air screw and 68 pilot. If air screw is out more than 1.25 turns I'll get a slight lean bog, at 1 turn out it pretty much eliminates it. Bike runs clean and stong. The air screw and 80 pilot jet that comes with the gytr kit is very rich down low.
I found the same thing. Was running a 65p 1.25 and got a bog on seat bounce jumps that required really quick blip of the throttle.Went to the 68p and it stopped the bog unless I tried going out further on air screw then it bog again. I bet a 70p may be the sweet spot that would allow the air screw to be more effective.
I am going to try the 2026 jetting next ride.
I seize the crank at 46hrs riding in a muddy practice and cool weather with the y4 pro-circuit jetting setting last week. I actually think was bad yamalube 2R (lumpy/clumpy) but figure good time to test also.
Cranks hard to find (back ordered) but wossner had one so going to try. Have had bad luck with anything else but oem so hoping the wossner is a quality item.
A 70 pilot would probably do the trick. I'm running a 170 main and will probably go to a 172 or 175 in the cooler weather coming. Y4 middle clip. Im about 800 feet above sea level.
I like oem also but Always heard good things about wossner pistons and cranks.
Ok
2024 yz125 - new crank /new top end.
Only thing not OEM is wossner crank (good luck finding oem) and boyesen rad valve.
So my review:
2200ft 27c (80f) - dry hardpack -testing against pro circuit Y4 suggested setting.(from memory 2weeks ago same track conditions but a bit cooler 24c)
65p air screw 2 1/2 out (tried 1 3/8 was abit burbly but not as bad as the old stock jetting)
95 power jet
N3EW 2nd
178main (should have been 172 according to )
So once I got the air screw right it’s still not as clean when off throttle/rolling on the throttle with clutch engage( read sweeping dry corner no ruts) as the y4 with 68p but responded better once throttle got just past the 1/8 open mark and pulled clean right through to the over rev.
At first I thought (sound thing I think?)was revving slower but I was jumping further on almost every jump that required full throttle application through the gears from the corner exit to jump face. It did not matter if it was a 3 gear close to corner jump or just shifting to fifth gear long run jump.
I did not conduct any lap times to confirm the jetting was actually better but I felt it was fore-sure on par with anything else and probably better. Even with being a bit rich so I think I’m keeping in for now. Had no bogs , hiccup or any other sign of trouble.
Second ride with the 2026 jetting. A bit cooler 23c but results the same. Think this jetting is staying in the bike.
Bike does not get rich feeling 15min into moto like the Y4 setting seemed to a little.
I got to try this jetting in race situation and while it’s good, with tacky ground and up hills right out of corners it lacked the cleanness /torque I was used to at this particular track.
I had race there earlier in the year with the GYTR Y4 needle setup also and it was lacking a bit in a few 4 to 5th sweeper situations I thought was the soft spongy ground conditions there.
I thought about when was the last time one of these 22-25 era bikes felt good at this track and it was in 22 with the 22-24 oem jetting adjusted for temp and elevation so I but the bullet and changed it between motos.it pulled hard everywhere It was lacking before and to be honest I never felt the burble on the bottom as really at race pace /conditions I’m never really there.
I think with more testing(CDI ETC) the 2026 jetting may be good I just didn’t get there yet.
This also so happens to be the mxa setting.
Do you think the 2026 jetting may be lean? I tried it last weekend and it got a little better as I went in on the air screw, but something feels off in the midrange. I'm going to try the 3rd clip position next.
No I would say rich.
I don’t know the difference in the needles but believe the 95 power jet is the issue.
The 2022-25 jetting cleaned up every thing minus the 0-1/8(maybe 1/4) throttle position but I never really noticed the rich pilot/needle straight portion.
I just noticed the N3EW needle is the same one used in the YZ250 - same clip position as well. Perhaps this is another cost saving measure to share parts between the two. Either way, I'm feeling less hopeful about this 2026 spec.
May take your advice and try the 2022 spec again before the year is up.
I'm still happy with the Y4 needle 3rd clip, 70 pilot, 170 main, stock air screw 1.5 turns out, 70 power jet. I prefer the stock air screw over the GYTR/2026 air screw with this set up.
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