All - I have searched and could not find an answer that fits my question. Looking at a 2014 FLHX with a 120R motor in it that is not running right. I have a SEPST and cannot find a good base tune for the 120R that works. I can find a base tune for the 120ST, but not the R. Using the 120ST base tune (bumped up to 130 ci) the system had horrible exhaust backfiring and loss of power under a load at low RPM's. I actually had to set it to auto tune and run it in N at various RPM ranges then create new maps with that in order to get it to clean up enough to move it down the road. After several runs with the auto tune it loses power at WOT in any gear at any RPM range. If I am cruising down the road (as long as I am not attempting to accelerate at WOT) it will run ok - though it seems to have less power than my 2014 STG 4 FHLTK. However, if I slow down to make a turn onto another street it begins to backfire through the exhaust and has no power (to the point I had to roll over to the shoulder at one point). Is there a 120R base map that works with the 2014 and newer TC bikes? Does anyone have any experience with a similar issue?