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Just bought a 2007 YZ250, my first 2 stroke.  Want to stud the tires and ride it through the winter.

Elevation is about 300m above sea level.  Temperature ranges 0 to -20 degrees Celcius.

What should I jet it at for these temperatures?  Do I change needle position also?

Not sure what current jetting is, oil ratio is 32:1 and tons of spooge out the exhaust pipe.

Thanks!

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