If you have a '99-'09 Yamaha YZ250 then you've got to check out Motocross Action Magazine's jetting specs, October 2009, pg. 106, "Yamaha YZ250 Jetting: 1999-2009." Just flip to the glossary and click on the article.
MXA's jetting specs are spot on, though you must remember they're running a stock bike at sea level where the average temperature is in the range of 60-70 degrees Fahrenheit.
Don't forget to consider the altitude and temperature differences for where you're riding in comparison to MXA's recommended settings. If you're riding in cooler temperatures or lower altitude you need to go richer. If you're riding in warmer temperatures or higher altitude you must go leaner. It takes some trial and error to get it just right.
Just remember to have fun out there on your blazing blue machine!
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