Thank you for that reply, Robert. We are somewhat familiar with jetting and altitude from dealing with dirt bikes. The thing is, this saw has "AutoTune", so it is supposed to adjust itself to different altitudes.That's why we bought it. Actually, I don't know if it even has the H and L adjustments....it's in the shop now, so I can't look at it. I remember last time we took it in, the repair guy mumbled something about there being "no adjustments". It is still under warranty, so I don't think we should have to do all kinds of work on it just to make it run. Again, thanks very much for your reply !!!!
Thanks for the link! Is this something a person could buy?