[soc_monki]

actually, the factory ECU does not adjust to altitude changes. there MAY be a slight ability to due to the air sensor, but there are no O2 sensors in the exhaust which would be the indicator of a system that can adjust due to monitoring exhaust gas contents, such as cars do.

so if you want to get it re-tuned for optimal performance than do so by all means, but i dont think its very necessary. the bike will still run, and run well, so you should be able to ride it without retuning. then when you find a good shop go ahead and get it retuned. but the ECU wont do it for you!