08 YZ450F Jetting specs?


8 replies to this topic
  • stevemorgan728

Posted April 14, 2009 - 10:14 AM

#1

Can anyone recommend proper jetting for an elevation of an average of 5500 ft.?

  • grayracer513

Posted April 14, 2009 - 01:26 PM

#2

Start here:

http://www.thumperta...ad.php?t=694921

When you find something you want to start with, reduce the size of the main and pilot jets by 1% for each 1000 feet of altitude increase from theirs to yours.

  • Se77vN

Posted April 14, 2009 - 02:30 PM

#3

Can anyone recommend proper jetting for an elevation of an average of 5500 ft.?


I am curious of this as well. I live in Albuquerque, NM which is right around the 5500 mark. I too get some popping on decel.

No offense gray, but the link for the 08 model does me (and the OP I suspect as well) no good as most of the posters are right around sea level.

It would be nice to hear some jetting details from other who are on or around our elevation.

Thank to all for your help and insight.

-JR

  • grayracer513

Posted April 14, 2009 - 02:40 PM

#4

No offense gray, but the link for the 08 model does me (and the OP I suspect as well) no good as most of the posters are right around sea level.

Did you miss the part where I told you how to correct for the altitude?

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Se77vN

Posted April 14, 2009 - 06:20 PM

#5

Did you miss the part where I told you how to correct for the altitude?


No, but again it would be nice to actually see someone post some real world results.

  • davcon

Posted April 15, 2009 - 06:05 AM

#6

Main Jet 160
Pilot Jet 45
Leak Jet 55
Stock Needle Position 3
Fuel Screw Turns 1-1/2
Altitude 5-7k
Temperature F 50
Plug Condition white
Result No Complaints

Stock 2008 YZ450 w/ PMB Spark Arrestor

Its running a bit lean but when I change the clip to 4 it "lopes" at low throttle. Just bought the bike new Nov 08 so havent had a chance to experience warm weather jetting yet. I suspect it will be pretty close.

  • grayracer513

Posted April 15, 2009 - 06:09 AM

#7

You should post this to the jetting DB. :p

  • davcon

Posted April 15, 2009 - 06:25 AM

#8

You should post this to the jetting DB. :p


Done :lol:

  • stevemorgan728

Posted April 16, 2009 - 02:00 PM

#9

thanks dude! According to the owner's manual, those specs are the same as stock. That's sweet because I guess I don't need to change a thing.





Related Content

Wiki
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info


Articles
  • 0 replies
Forums
Photo

Snake pit oct 30th by The Anvil


Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies
Forums
Photo

First Hare scramble tips by dhend8


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

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
Forums
Photo

Michigan Motocross Tires by 288yz450


Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply
 
x

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.