2006 YZ250F Pilot Jet Replacement Help

Hello, I have a 2006 YZ250F in which I'm pretty sure I need to clean/replace the pilot jet. I bought the bike last year and it ran pretty well. Fast forward to this year and I didn't properly store it for the winter so now the bike only idles with the choke. Without the choke, it used to idle for less than 10 seconds before dying. I tried to clean the pilot jet today but I couldn't see the pilot jet after taking off the fuel bowl because there wasn't a lot of space so I tried to clean it by sticking a wire through it. It helped and now my bike can idle without the choke but it is still pretty hesitant from 0 ~ 1/4 throttle. I'm fairly certain that the jet isn't completely cleaned. So my question is can I remove the pilot jet without removing the entire carb? I tried to rotate the carb towards me when I was working on it to help improve the visibility but I still couldn't see the pilot jet. I could stick my flathead in the hole and sometimes it seemed as if I had it placed correctly but I wasn't sure and I didn't want to risk stripping it or something. I couldn't rotate the carb more because something on the top of the carb (I think it may be the hot start) was hitting the frame. I really don't want to take the entire carb out to replace the pilot jet so can someone tell me how they do it? Thank you.

You give up waaaay too easily



Stubby bit driver

Flat bit

Phillips bit (prefferably the ISO tip if you have one)

4.0 straight screwdiver (for the pilot jet)

Lay the bike on the ground

Loosen the boots and gently twist the bottom of the carb toward you (left side)



DO NOT clean the jet, buy a new one

I did loosen the two clamps for the boots and moved the carb toward me but it didn't help much because something attached to the top of the carb was hitting a part of the frame. I could barely see a little part of the pilot jet because the carb couldn't be angled any further. I will try again tomorrow after buying the new jet and I'll lay down the bike so it's easier to work.

Edited by yz250fv

Use a small dental mirror. Eventually, you'll just know the spot the pilot jet is and you'll not need to do anything special.


I use the Motion Pro 90 degree tool.


DO NOT over tighten the jet or force in a screwdriver blade any wider then the pilot jet or you will break the carb.

Ok thank you. How much more of a turn would you recommend after the jet makes contact with the "seating surface"? (if I very lightly turn the screwdriver until it stops, how much more of a turn?)

Just snug. Not even a quarter turn. Better to fall out than snap off or be near permanently stuck.

Grab your finger, now twist. About that much.

Takes about 10 mins to take off gas tank, sub frame, and rear shock.. Get a cordless impact and its a breeze

Takes about 10 mins to take off gas tank, sub frame, and rear shock.. Get a cordless impact and its a breeze

No need to do all that to swap a pilot. Remove the 17mm cap on the bottom of the float bowl, remove the jet, replace., two real, not TV, minutes.

No need to do all that to swap a pilot. Remove the 17mm cap on the bottom of the float bowl, remove the jet, replace., two real, not TV, minutes.

Very true. I just enjoy it

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By Jturn
      38MM Cast SmartCarb. Purchased a couple years ago for a yz250. Don't have the bike anymore, and it has been sitting around for about a year. Used, but in fine working condition. You can also purchase a different needle for different bikes, as well as rebuild kits from their website.
      Asking $250 shipped to continental United States. I can arrange other shipping options at the buyers expense.
    • By faizakhtar125
      Hey guys I just bought a bike last night. So the seller said the bike will turn on but then die. We didn't try it because it was really late at night and it was raining (seat was wet). But he said if you bump start it, it will turn on and ride. So what do you think the problem is? I just want to make sure it runs... I probably won't be able to bump start it till Saturday (rain)... It's a four stroke, and I know absolutely nothing about them. Thanks.
    • By knotduke08
      I know this topic has been discussed in the past, but I have not found any options available for the new 2018 bikes. I live and work for a new Beta Dealer (Auburn Extreme Powersports) in California, and we are having a difficult time mapping the RR-S bikes for full FMF exhausts. We have tried contacting Beta Support several times for this issue to no avail, and we typically are given the runaround when transferring to techs and secretaries. From what we can gather, the FMF flash is designed for the RR bikes, but not the street-legal counterparts. Every time we try to install the FMF map onto an RR-S errors occur, and the programmer screen goes virtually blank. We have heard through the grapevine that some are using the RR maps on the RR-S with success, but we have yet to try it, even on our own bikes for fear that it will permanently erase or damage the CDI. Any and all help or suggestions regarding this topic would surely be appreciated! Thanks, Ben.
    • By husky159
      I have the following to sell...
      215 grip studs with the insert tool. Only 2 rides on them. $70 + shipping 
      Stock 17’ 300xc silencer with enduro engineering spark arrestor. (Small dent, a few scratches) $70+shipping 
      hyde skid plate for 17’ 300xc in good shape just your normal scratches. $60+shipping
      mikuni 40mm carb with 2-3 rides on it. Includes throttle cable/ tube. Also extra jets and such. $175+shipping
      feel free to ask for more photos
    • By Charles Mrizek
      This replaces the tube that connects the two carbs on a 1987 Honda XR600R (it may fit other years). 
      Made in the USA. 
      Constructed of TPU  (solvent safe plastic.)
       Its durable stiff abrasion resistant yet flexible enough you never have to worry about breaking it when you're taking apart your carbs. 
      Fits the o-ring perfectly and slips into the carb nice and tight.
      Matches the rear shock coil. 
      If you would like to buy one contact me via e-mail. They cost $20 Shipping is free (anywhere in the USA). $10 off for active duty or retired military.
      Make your subject: XR600r