Hi all :) Thanks for suggestion. Tomorrow I will gonna check and clean all wire connection around starter motor, solenoid and battery. By the way my starter motor is M35J Lucas so standard one. Brushes thickness is 11 mm so perfect . But today I checked armature shaft and I realized that commutator is bit worn. I'm not really sure and maybe it's normal usage, but external edge is about 1mm higher than surfaces where brushes are touching the commutator. I will clean the gaps in commutator face and maybe this will something help because these gaps are full of black dust or something like that. When I touch by finger the commutator face I couldn't feel any gaps.