Originally Posted by KHVol
Just be careful about jetting too lean, you will cross passes 12,000 ft or so but most of the time you will be below that and you don't want to be too lean most of the time.
If you base out of Ouray you will be a little over 8,000 feet. If you are going to be running on the road from trail to trail, say around Montrose, you will be even "lower" and running at speeds from 55 to 65 mph.
should not be an issue....going from 152 to 148 worked for the 13k elevations and I ran it all over Colorado and down to 4,000 ft in Moab with excellent results.
Going to Baja and running at sea level I just went up to 155 and 158