03 450F Elevation Question

I have a 03 450F that I use at about 1500' and I plan on going to an elevation of about 9000' just to do some trail riding and I am wondering if I should look at re-jetting my bike? Any help would be appreciated.

I have a 03 450F that I use at about 1500' and I plan on going to an elevation of about 9000' just to do some trail riding and I am wondering if I should look at re-jetting my bike? Any help would be appreciated.
You'll be about two sizes too fat, which may be enough to make it run bad.

My altitude correction formula suggests you multiply your mainjet size by 0.93, which would take a 165 to 154, the nearset size being 155.

I have a 03 450F that I use at about 1500' and I plan on going to an elevation of about 9000' just to do some trail riding and I am wondering if I should look at re-jetting my bike? Any help would be appreciated.

One question, Why couldn't you look at the sticky with the jetting tips in it? YOu wouldn't have needed to ask this question if you had. :bonk:

anyhow,

If your bike matches my setup, you'll be good to go. That's mostly where I ride. :excuseme:

Model: 2003 YZ450f

Edit Revision:12/12/05

Timing:

Main Jet: 158

Pilot Jet:38 (edited)

Starter Jet: stock?

Leak: n/a

Fuel screw: Zyp Ty 1 1/2 turns out

Needle: #3 clip ( stock)

Air box: Twin Air and Unis

Pipe/muffler: Stock header, FMF Q (older version)

Altitude: 5700 feet and up to 11k

Temp:current 40-80F

Humidity: 30%

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