Hya there bro, as an extreme example to make things simple, the higher you go up the thinner the air becomes, therefore,what you are getting is less air.......just like when you got your choke on....your getting a rich mixture, but of course if your bike was set up Ok at normal altitude,you could not run for long with your choke on could you? It would start to spit and pop and run like a pig and stop, and wouldnt start till it was cold again!!
So, at altitude you got less air in effect, but its a lot harder to get more air in to make the mixture right, then to lessen the fuel? yes? so, take with you a couple or three sets of jets(there cheap as chips) that are varying grades smaller then what you are running at the moment..........try a size down whenyou get there and go from there........
remember, that as you are reducing the fuel to match the lack of air, you WILL also have to raise the tickover to compensate.......Its the correction of "mixture" thats important........
As with all jet changing/tuning operations, you start by using the jets that make it pull the hardest at "wot" ( wide open throttle) settings without bogging as the first step in jet choice, But, that is only the first step in a greater procedure.........If you are interested in the whole procedure, i can mail you the details, it takes up too much room here!!!
good luck, and enjoy the change of scenery!
