I was told that my 83 with 4 carbs is jetted to be used in Denver, Co. I live in NE Kansas. It runs really well and I still get 35 mpg. Should I spend the time and money to have it rejetted. Some have told me I need to and others say just let it be if it is running that good. Can anyone with more experience with this issue help me out. Have been riding it for the past three years this way. Thanks for any help.