Reply To: Possible ECU issues GV125S
Yes add the picture as Hyosung made 2 variations of the GV125 EFi ECU’s , they may have updated it again for 2025 onwards but could still be V2 type.
Anyway, have a look at this thread and see if you can investigate your ISCV unit to maintain the idle.
GV125s idle speed when hot / ISCV problem (Idle Speed Control)
if it starts , the ECU still has some life left, so i wouldn’t say it is completely toast.