If your plug is burning white, it's running way too lean. It's being starved for fuel and can't run on air alone. A larger main jet is a must. At your elevation with stock engine, a 114 might work. Here is a guide to help with jetting.
http://www.4strokes.com/tech/howtojet.asp
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08 Joyner SV 250 17grm sliders,white main spring,UNI,130 main,40 pilot,22x810 Kenda Front Max,23x10x10 ITP Muddlites
08 ASW Carbide (my son's)Lots of mods
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