Replacing main jet on a 01 426

3 replies to this topic
  • 426scooby

Posted February 11, 2002 - 03:52 PM


New to the motorcycle world, looking for some help on how to change the main jet on a 01 426.
I have the owners manual but is no real help to a novice. Thanks for the Help!!!

  • Wyatt

Posted February 11, 2002 - 04:04 PM


You need a 17mm socket and a 6mm socket. First, drain the carb bowl with the drain screw. (allen head) Remove the large plug on the bottom of the carb bowl. You will be able to see the tip of the main jet if you look into the hole. Use the 6mm to take it out. You can do it in less than two minutes.

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

Posted February 11, 2002 - 04:10 PM


Turn off your fuel at the petcock and run your engine until you suck the carb dry.

what he said above!! :D


You WILL have gasoline EVERWHERE unless you turn your petcock off and run your carb dry of fuel.

[ February 11, 2002: Message edited by: NH Kevin ]

  • Boit

Posted February 12, 2002 - 03:11 PM


Ditto on the above advice. Also, if you use one of those small mechanic's mirrors, you can see up into the bottom of the carb and locate the main jet and pilot jet. When installing a main jet, don't over tighten. It's only brass so it will strip easily. Just snug and then a little more will suffice. Be gentle.

Related Content


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

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies

05 yz450f not fast enough by RedeyeYZ

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  38 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 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.