7" prop and EMAX RS2 2306 Thrust test goes wrong 

On my 7" LongRange I found out that 1 motor goes slower than others.
Also visible on blackbox data, one motor runs 100% but the others only around 70%
I decide to bench test that motor on thrust meter as it should pull 1,8 Kg.
Results was burned motor and ESC
Initial issue was probably sand/dirt in motor what caused a bit burnt winding.
Else also propellers was to big for this motor with 6S Lipo.
Thrust tester used:
Mayatech MT10PRO
s.click.aliexpress.com/e/_DBh...
components:
Motor: Emax RSII 2306 1900KV 4-6S s.click.aliexpress.com/e/_DkI...
Prop: Gemfan Flash 7040 7X4X3 s.click.aliexpress.com/e/_DFR...
ESC: IFlight SucceX 50A s.click.aliexpress.com/e/_DBz...
Lipo: Tattu R-Line V3 1400mAh 120C 6S s.click.aliexpress.com/e/_dSP...