I am making a trip to Arizona with my bikes (yz450, yz85, crf230). The bikes are jetted fine for Florida, but I'll be running them around 5000 to 6500 feet above sea level compared to the 100 feet that I'm riding now. I am sure I'll have jetting issues with the yz's (stock jets). I am not going to race, just trail ride with the family so optimum performance isn't a major factor. I just want to keep them running decently without causing damage. Do you think I could richen the the mixture enough by adjusting the carb for the altitude? If I need to get some bigger jets, what would you recommend?