When I first got my bike, I put the Harley recommended tune in my ecm. Now three years later after my last update for the SE program that we run in or laptops, Harley want's me to use a new tune and it will not allow me to put my old tune back in the bike. My old tune is still in my bike. The different between the two tunes is mostly in the timing and a little change in the ve's. My old tune runs fine a little lean but not that bad, 15k miles on the bike no problem at all.

Is it worth the effort to put the new tune in my ecm?

 

When I call up my old tune this banner comes up

The starting calibration associated with the user calibration was replaced by an improved calibration. Consult the What's New and Calibration Description documents for any additional information regarding the improved calibration.

It is required that you upgrade your calibration to the improved version. The starting calibration cannot be flashed to an ECM.

Follow the copy and paste procedure in the Help file to create a new, updated user calibration.

 

Can you save the old one and try the new one ?
Or do you not go past go at all if you don't apply the new tune ?