I just learned that my carb has buried in it high altitude jets that I can switch into my Aisin carb. I know that I read somewhere here that they are recommended above a certain altitude, 4500 feet IIRC. However, I wondered if some of you with experience could chime in and let me know if you agree that it would be worth doing. I live at 5150 and play at that elevation and above for the most part.