Yes, this is a well-known phenomenon. As you gain in altitude, the bike gets less oxygen and starts to run richer. Likewise, if you bike is jetted to run well at high altitude, it will run much leaner at sea level.
The proper way to solve this is to simply swap out jets and needle position to settings approriate for your altitude.
BE SURE to put sea-level jetting back in your bike as you go down to lower altitudes. When an engine runs lean, it can get very hot and damage the engine.
Wright
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