2-Stroke Jetting Basics and Carb Tips

Here are some basics for you on how to jet your 2-stroke. We did this with our RM125.

Jay Clark/Dirt Bike TV has been around the Dirt Bike industry for thirty years and is always looking to learn and help others do so as well. Give a follow or drop an email if you have any questions or comments. Thanks for watching!
Instagram: @dirtbiketv1

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#2stroke #dirtbike #rm125

[matthewnorris]

I really like watching your videos. You’re straight to the point without any dramatics. I appreciate that.

[JacksonD]

You’re the man, Jay! It’s a blessing to have someone knowledgeable willing to put this information out there… Cheers to you!

[townsendYXZ]

Never heard of that little compressed air trick at the end that was pretty neat will be putting that in my tool box.

[jimmyneutron]

Id like to know when a bike comes to you, how you diagnose that you need to adjust the carburator. Then how do you diagnose when to charge jets. Reading a plug exc

[matthewnorris]

When you started it, I got a big smile on my face 😊
Also, VESSEL JIS screwdrivers. They’re AWESOME. No screw stripping

[carsonpoole]

Excellent channel, best in the business

[TheCarlejoseph]

Thanks for the tips. Jetting can be a pain.

[Dirt_Bike_Dave]

Thanks Jay...you can never have to much info on doing the jetting .

[e.rtraining]

Nice clear video. Quick question. When you were putting the needle back in the carb, there is a small nut that locks in the needle. I’m looking in the RM 250 manual and it shows a small spring between the nut and the needle. Couldn’t see if you had that?

[dougb]

Thank you Jay. Very helpful on my 99 yz250 getting dialed in after carb rebuild. The challenge is idle adjustments since it's done with choke on a Keihin.

[Workerbee-zynx]

I learned stock to begin with at normal altitudes, then the higher up the jetting needs change, or temp and air density changes dictate. I do it in 1 step increments.

[billbright]

A carburetor can only preform as it is pre programmed.
Proper fuel to air ratio for combustion across the rpm spectrum of the engine.
The more carburetors the more potential for a mistake in tuning.
Altitude extremes can cause necessary jetting changes. Also oil premix ratios. More oil means a leaner fuel mixture as oil not nearly as combustible as gasoline.
Ethanol is junk foisted off by Congress and is to be avoided in racing engines.

[jcbenson]

I was hoping for some plug reading and discussion about plug chops.

[raarons]

6:59 Guitar G/B string works great for cleaning out jets..

[crashed]

I was always told never to use wire to clean jets as it will gouge the brass inside and you now have richer jet. Be gentle :)

[bradmckinnon]

Legend mate! This helped me out a lot today 🙌💯 appreciate the content!

[legenderekonwheels]

They aren't Philip's head screws, they are JIS

[Haze-derr]

I have a husqvarna cr 2001 250cc there is no jetting recommendations on the side bought a new carb keihin pwk 38mm Carburettor the shop said it was ready to ride but it just bogs out when trying to give throttle

[patrickmuller]

Only think i learend where that theres diferent slides not even knowing what the diference

[MXguy]

Anybody have any tips for getting rid of that initial bog right off the bottom of a 250 2 smoker?