Ecu security motor conversion sportster

[DHG69]

Hi I am going to pick up a 2016 883 with A blown motor and wanted to convert it to a 1200cc
What do I need to do with the ECU to make it work with new motor and accept any alarm/ security issues?
Thanks in advance

 

[Jeff Klarich]

Welcome to HDT from sunny AZ.

 

[Joyflyin]

Welcome aboard, glad to have you here!

 

[liquid_wrench]

Welcome from Ohio.

 

[gator508]

Welcome from Gulf Coast AL, you question is above my pay grade, but someone will chime in to help.