hello.
i cleaned my starter motor recently. the motor has been working fine so my only purpose was to clean it
i disassembled the motor and cleaned it. brushes were in good shape and the length of the brushes were ok with the manual.
then before assembly i did a conduction test according to the manual. all went very well but i could see a conduction in between armature segments and the armature shaft (marked with a red line in the below picture). according to the manual there shouldn't be any conduction.

all other conduction test were ok. winding was in a good shape. no abnormal color. armature segments and the commutator segments were ok too. no abnormal color. so i assembled it.
my bike is a CBR250RR and i've done 20000km+ so far. so what i need to know is how this affect my motor and my motorcycle electrical system? the motor works fine as usual (also haven't had any problem in the past). i bother since i failed one of the conduction test and this was the first time i disassembled it. do i really need to care about this ? please give some advice. thank you.