YZ426F jetting @ 5000'

4 replies to this topic
  • Greg1023

Posted July 21, 2006 - 06:50 AM


Just bought a YZ426F with an aftermarket Dirt Squirt exhaust pipe. I know the stock jetting has been changed, but is most likely set up for sea level. What will happen if I don't rejet for 5000'?

  • dmg426

Posted July 21, 2006 - 11:34 AM


If it is jetted correctly for sea level and the temp is close to the same as it is at 5000', the bike will run rich.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Greg1023

Posted July 21, 2006 - 02:54 PM


It will be much hotter. Probably in the high 90's. I'm guessing it will be ok for a few rides in the dunes...

  • Ducksgoquak

Posted July 23, 2006 - 08:41 AM


Jetting is extremely easy to change. If you are going up in elevation just go buy the next couple jets below the one you currently have and bring them with you (might want to bring an extra spark plug too just incase). Ride your bike around a little bit with each jet in and figure out where it's running the best.

That's usually my simple approuch for a 4stroke though. Although, most of the time going from 1500 ft where i live to the coast with different air conditions as well, i'm fine with the same jetting.

  • trail

Posted July 24, 2006 - 05:11 PM


I am at 5000 feet and Im At a 158 main, 42 pilot and 2nd slot on the needle...

Related Content


Should I buy this bike? help....... by Numsa Hul

Dirt Bike   General Dirt Bike Forums   What bike should I buy?
  • * * * * *
  • 10 replies

BIGBORE FOR YZ450F 2006? by Taattie94

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

Wilson the Blue Privateer by jetfuel

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  50 replies

Megabomb Fitment by 288yz450

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 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.