Where I ride (Newfoundland, Canada) the elevation is mostly below the 600m elevation the Summit was factory calibrated for. In fact the highest peak on the island is 810m.

So, according to the manual and a label on the sled (oh, I bought at the end of last season so I haven't even ridden it yet) she is factory calibrated for riding at an altitude between 600m & 2000m (1800 - 6000 ft.)

All my riding will be below this so what is involved with the re-calibration? Is this something that can be done myself given the right parts?

http://www.ski-doo.com/en-CA/Parts.htm

check out the microfiche. search tab = "advanced"
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when picking the model, put in "summit" and search all summit models

You'll see duplicates for each model.
**Summit 600 HO SDI, Adrenaline, 2006
Summit 600 HO SDI, Adrenaline, 2006;
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To pick the english file, always choose the top of the duplicate.

Should be able to find the parts you look for in "pulley"