I've got a 2009 Grizzly 450 down on an island here in TX, so right at sea level. We're planning to boat it back across the bay and up to Colorado to assist with an Elk hunt this November. Obviously quite a bit of altitude gain. Right now she requires a little choke or just a heavy throttle thumb for a minute or so until she warms up then she'll idle fine. I'm thinking between the altitude and the MUCH colder temps I need to pay attention to the carb to be sure she runs smoothly up there. I don't know too much about carburetors so figured I'd ask here and see what's recommended.