It's not easy to see if the bike runs lean. One way is to read the plugs but with todays petrol this is pretty difficult. It's possible to install an AF-meter on the bike, but that's maybe a bit extreme...
There is no way to make a carbed bike run perfect at all elevations but a good start is that it runs right at sea-level. Best way to do this (especially on a bike with modified exhaust) is to overhaul the carbs and then take a dyno-run where you adjust to get the right air/fuel-ratio. This might involve changing jets.
If the air/fuel-ratio is correct at sea-level you can usually go up to at least 3000 metrers (10.000 ft) without problems, but you will loose power and your idle will decrease.
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