Great video. Great explanation on the 0-1/4 throttle pilot jet. Since the bike was running it was easy to understand what you were talking about.

I have watched a few videos on jetting and so far this has made more sense than all others! Thank you!

Dude you’re jetting theory is spot on

This is a wonderful video! I appreciate the time you took to make it!

Thank you man I’m new and this really helped me understand what to lean and rich sounds like great vid

Badass bro got me pumped up ready to race

please more videos like this we love this ❤️

Good video, you are pretty spot on about what you said. Fuel lean side does not make more power, it just spools up faster and freely. Slightly fuel rich makes more torque and doesn't spool up as fast. Everything else you said was correct.

The Needle, and clip position affects more of the range of throttle positions and RPM range than any other circuit in the carburetor. Your air screw might be able to take the fuel rich gargle off idle out by adding more air. But l wouldn't worry about it. When the Midrange hits, it will be better when rich off the bottom.

i have gone leaner on my pilot and main, it def responds better coming out of turns but still shows its running rich by looking at the plug

Why do this master piece only have 100 views 😮‍💨

Sound mate I’ve got the yz125 2006 standard a part from DEP exhaust Vforce3 reeds bike runs good only problem is when the powerband kicks in feels so smooth not snappy got good bottom end power can have it in 3rd speed will pick up pretty fast from low revs

Sick! You can tell it likes more fuel up top! Pulls like crazy The 22s are different stock pilot is 75 and main is 160 I’m in Texas too I ended up going 72 on pilot (that’s the only other factory jet I have) because it was real gargly but was great maybe too lean up top and went 162 on main. Reading the manual it said to add a turn out on the air screw so I did and so far it’s been pretty good. Maybe a tad rich on bottom but that’s 👌 Great video I always go back to your yz125 rebuild video because I’m still working on my 05 I have the cases split now I just need to get a bearing puller and make sure I know which way they go

Good video but fuel screw n needles matter for perfection. Most dirt bikes come lean on the slow n ritch on the main from factory.

Just wondering what bar bend you use and how tall you are. Great video.

What jet number you have and what number you changed?? Thanks 👍🙏

I have a 2018 yz125 have full fmf with powercore 2 stock jetting does it need to be adjusted with rad valve as well just picked up rad valve and apex head

Do you ever have to mess with the idle screw or air screw when you change pilot jet or main jet?

what main and pilot jet is in there i cant seem to find what the stock ones are online

Would it be bad to use a 50 pilot? And a 170 main jet. Not sure what would be too lean on pilot

Whats your trick for listening to a fat vs lean top end?

Where are you riding, fella? Iowa?

Great video! I have a 2021 yz125x. Know nothing, literally, about jetting. If I put a turbinecore 2 arrestor/silencer on it I’m assuming that will have better airflow. Does that mean I should go a little richer on both the pilot and main? Signed, clueless :-)

What is jetting, from a 125 DT user?... I guess I have a lot to learn

I am shocked to hear you say you've never adjusted needle clip position! That's the most important circuit because thats where we spend most of our riding time (between 1/4 to 3/4 throttle) In this video you are riding around in your needle circuit except at the end when hitting the track. I thought your pilot sounded perfect from the beginning but was thinking you could with a drop in needle position by raising the clip up one. And you should only ever change one circuit at a time. That way you can specifically pinpoint what your changes did to your performance. You know that you have the correct pilot when you have the smooth, crisp "pickup" and response you're looking for with the air screw position at as close to 1.5 turns out as possible. From the sound of your bike, I suggest going back to bigger pilot, drop needle clip one, and your main sounded fine both ways. Any time your bike blubbers in this video, that can be fixed with needle clip position.

What camera did you use for this video, quality is amazing

I don't know if I should change out the jetting or not on my rm125, before I ran klotz super techniplate oil with 20% castor, had alot of spooge but never bogged or hesitated, I switched to klotz r50 oil whitch has a higher flash point and it still has the same spooge, but now it seems harder to clear out the bike, as in it gets gummed up alot easier. At high rpms it runs great, but if it let it run low at all it gums up super quick

Just got a 2024 yz 125 and 2024 yz65 for my son

Looks like she's fast af

Anyone knows or has an idea why my bike is spitting out oil from silencer ? “Spooge” I have stock settings in my bike. 2023 yz125. Never messed w jets or screws.

You’re on the needle circuit bro. Drop two clips.

Can’t you just adjust the air/fuel screw to dial in the low jet?

Im sorry, I went down 1 more size on the pilot than you did

I didn’t jet mine I just put a lectrone in 😂

Anyone knows or has an idea why my bike is spitting out oil from silencer ? “Spooge” I have stock settings in my bike. 2023 yz125. Never messed w jets or screws.