New YZ 400F Rider question

5 replies to this topic
  • YZRider400

Posted April 20, 2007 - 05:19 PM


I`m a new rider and am learning the ropes slowly. What is the ribbed knob by the carb, I`m assuming it is the idle adjustment, if so is it just a stop adjustment or is it low speed jet adjustment. If it is a jet adjustment what should it be.
Thanks for any feed back

  • gbalias

Posted April 20, 2007 - 05:40 PM


its a stop adjustment for the throttle wheel.

  • 642MX

Posted April 20, 2007 - 05:59 PM


Yep, its an idle adjustment screw. Turn it in to increase your idle and turn it out to decrease your idle.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • 1rkcooper

Posted April 20, 2007 - 06:32 PM


Check out the common threads at the top of this forum there is a ton of useful info there. May not cover this question but has much info in it.

  • YZRider400

Posted April 21, 2007 - 03:47 AM


Thanks for the info

  • grayracer513

Posted April 21, 2007 - 07:06 AM


If the knob seems difficult to turn, remove the throttle cable cover from the right side of the carb and hit the threads of the actual stop screw with some dry moly spray lube.

Sounds like you may also want a manual:

Related Content


Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

yz400f throttle bog by yz400fmaniac

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • * * * * *
  • Hot  28 replies

Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 replies

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies

Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.