Elevation ?

Would 600' lower elevation change jetting in 2003 YZ450? If so what would changes be ? :smirk:

Properly jetted, I can go from 2800 ft upwards of 6000 (give or take) with minor adjustments to the fuel screw.

Would 600' lower elevation change jetting in 2003 YZ450? If so what would changes be ? :smirk:

It could. Jet for the altitude, temperature, humidity, etc. The air is denser at a lower altitude so opening the fuel screw a bit may fix it, or if other conditions changed you might need to rejet. I normally go from 1400' to sea level with no significant issue, but each bike is different and you might be lean already.

If 600 feet makes any difference, it's because your current jetting is wrong. I run the same jetting from 100 feet below sea level to just under 4000 feet, changing the main twice a year to adjust for the seasonal temperature changes. They just aren't that sensitive to it.

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