Back in the day, before I retired, I ran ( owned) a Landscaping company. I had about 20 saws, a few of which were the same, except for the bar(s). Small stuff? grab the 14 inch bar. Bigger stuff? Grab an identical saw with a 20 inch bar. Smaller bars always seem to cut quicker, due to less power loss pulling the chain.
Truthfully, I never re-tuned for a bar change.. It never crossed my mind to do so. It's also pretty flat where I am, not enough change in elevation to have to worry about altitude. I usually just pull the thingy over to the Winter setting in the carb, to prevent icing when it's cold outside.
As I always run the same oil and gas, at the same ratio, I seldom even think about re-tuning the carb. 91 Octane Ethanol free Premium, and 70 to 1 Amsoil Saber.
I Alaskan mill with an old school Stihl. I never changed the carb settings, when I purposed it for milling. Same fuel and mix as the rest of the crew. It truly didn't seem to mind at all. But I might think about putting in a touch more Saber into the tank.. A fouled plug is way cheaper than a new top end.
