How many Amps do you think a X30 starter pulls? I have not verified it. Maybe I should…
The std wire in the harness is 10G I believe, based on what I measured. DTP contacts can handle 10G if you use the stamped contacts. Now, you may still be right about the DTP being borderline… 10G wire is normally rated for 30A. Deutsch DTP contacts are rated for 25A.
For reference, a Honda CRF450X draws about 24-25A when starting. Yamaha R1 draws 100-120A…but that is a 4 cylinder 1000cc motor. I tend to think a dinky little 125 2T will be OK at 25A.