jetting 01 426

2 replies to this topic
  • blaze

Posted August 21, 2001 - 10:18 PM


im living at 8000 thousand feet and ride to 10. when i first got my bike it was fowling plugs. the stock main jet was 162 and the pilot 42. right now i have a 152 main jet with the needle in the last position,1. pilot 1 turn out. its not fowling plugs anymore but it is running crapy, it was popping so i turned the pilot out 1 turn to stop that, but bottom to mid breaks up. any suggestions would greatly be apprciated. thanks-alex

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

Posted August 22, 2001 - 10:43 AM


Alex, I also have an 01' YZ 426. I live at sea level, so the stock jetting works fine for me. However, I just came back from a trip to Colorado where I was riding anywhere from 5000 ft. up to 13,000 ft.. I had a 152 main, a 38 pilot, and the clip on the needle in the 2nd position. I didn't fool with any screws, or anything else. The bike ran pretty good with this set up, it was still a little rich up around 12,000 ft but it ran smoothly.


  • blaze

Posted August 22, 2001 - 09:01 PM


thanks for the info john, i will try the settings and let you know how they work.-alex

Related Content


Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 replies

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies

Is the 2016 GYTR Yamaha YZ450F too fast? by Fryboy

Dirt Bike   Special Interest Forums   Pro Racing
  • * - - - -
  • Hot  241 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

yz400f throttle bog by yz400fmaniac

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