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Power loss in carburetted engines is about 3% for each 1000 ft. of altitude. You would need to lean our you engine a little for those altitudes to keep it from running too rich.

That is correct. The air is much thinner up there so a slight adjustment on the air fuel screw will most likely be needed.

I added a pdf of the wiring of the various connectors used in vehicle socket and trailer plug wiring to the "Other ATV files" section in downloads.

I have an arsenal of bikes. I ride anywhere from my 420 atv to my Kx 250. My kids ride the same from a 350 to an xr80. We have a few to say the least.