How to Jet a 2 Stroke Dirtbike (2018 YZ125)

[@jshdtrch1]

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.

[@markfletcher3728]

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

[@gregorykelly7452]

Thanks man I’ve been on 4 strokes my whole time riding and I’ve been on some 2 strokes. But never had to work on them and you made it way easier than all the other videos I’ve been watching thank man.

[@mkdundee4785]

Dude you’re jetting theory is spot on

[@raymondsiewert2720]

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.

[@raymondsiewert2720]

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.

[@outdoorking45]

Why do this master piece only have 100 views 😮‍💨

[@outdoorking45]

It need to be around 100k

[@brapbrapmafucka]

People dont even know what jetting is. Let alone how to dial in or repair anything on their own

[@reggienewland377]

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

[@blainewigley4622]

Mine has symptoms of both. Slight hanging idle but also a slight bog at low rpm

[@motorsandmore3768]

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

[@donalddonaldson7211]

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

[@didickcheeseburger]

the 22 yz125 has keihin carb vs mikuni on the older bikes. thats probably why the jet size numbers are so different but im not sure because i dont know that much about carbs

[@owens5283]

@@didickcheeseburger it is there numbered way different

[@2smokecuts]

You should try jd jetting kit. It tells you to add a 50 pilot and 170 main. It comes with a aftermarket needle that you have to put on the 4 ring. It runs good. Bottom end is crazy touchy. Not sure if it’s healthy for the engine since it’s super lean. I’m still doing research on that.

[@michaelgarland579]

Badass bro got me pumped up ready to race

[@apocolypse11]

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.

[@936smith8]

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

[@703Youngster]

Because your actually running rich

[@joshuarudd7690]

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

[@brycegiddy8113]

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

[@itz-bl-ak-aye7368]

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

[@santretaylor4352]

I have a question what position is the needle in

[@ssim5964]

please more videos like this we love this ❤️

[@2smokecuts]

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

[@starcastleLomitas]

my 2024 can with extra jets and needles, but they say 162, 165 & 185, not same numbers as you reference, what does that mean?

[@Bikelyfe_gordo]

my bike starts to bog when im 6 th gear wants to cut off but i keep giving it gas it comes back but sumtimes it dies but i can ride around with no problem only when in 6th going fast ive changed carb and jets to oem and tried every size and nothing any idea what it can be ?

[@hansjohnson9459]

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 :-)

[@joeydirt420]

From what ive heard it doesnt effect it enough to need to jet differently

[@2smokecuts]

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

[@cyrusgachugi5847]

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

[@nitroheal5903]

that thing is fast no joke

[@RobertDamien8687]

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

[@davidu8688]

I feel like mine is jetted badly Can opening the air screw help out?

[@mgtowlevel5293]

LOL best laugh all day! What size displacement? Carburetor size? Do you know what Jets you're running in there now?

[@tonyrichengod9280]

Where are you riding, fella? Iowa?

[@legenderekonwheels]

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.

[@nathanharambe5521]

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

[@RwP223]

I've read spooge is from being too rich afr overall, not really oil mix

[@oliverp3926]

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

[@LCARSADV]

He's recording at 60fps which makes things look clearer

[@steliosapergis]

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

[@bulkleyoutdoors]

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

[@joshmacneil25]

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

[@2smokecuts]

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.

[@dreamrideflorida]

My 2023 is running rich on the bottom from stock settings and even ridding it very hard I’m still getting oil on silencer. I’ve just changed pilot from the 75 to a 72 and dropped the needle I position to the top clip. Guna see how that works. I’m leaving main jet alone but may drop the pilot to a 70 if it still seems rich on the bottom end

[@2smokecuts]

Let me know and keep me updated please!

[@freetaylor72]

Looks like she's fast af

[@rearwheelslider]

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

[@izzyauna8814]

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

[@akmoto_]

For fine tuning yes you can!

[@wufijs7507]

@@akmoto_ what starting point would u recommend for the screw to be at?

[@mikesims8054]

Good video, Yes, its time consuming, but a good jetted bike for your area, temp, and humidity runs so good. I have the same bike and ride middle Georgia, I went down to a 34 pilot and raised the clip on the needle by one to lower the needle a little. It still is a little rich off the bottom, but I agree with you, better a little rich, than to lean.

[@mikesims8054]

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

[@jakedarlak9524]

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

[@mmholling87]

Pilot is fat. Just back out your air screw.

[@2smokecuts]

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.

[@austinbrown7921]

Mine does the same honestly from what I’ve read it’s not a big deal