I replaced the ECU/ECM with the Z8 unit also.  Part number 0800-174000-2000  - Z8.  It cost $375 with shipping. Huge improvement.
It runs like it should. no more stalling on acceleration runs smoother then before.
https://www.cfmotowarehouse.com/
Brolin, CFMOTO SUPERSTORE


2021 Uforce 800
BillZ