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On power-up, I am getting sparks between brushes and armature. After one minute of running, the commutator already turned darker and the upper motor part got hot. As I have no access to original brushes which are two-part, I replaced them with single-block brushes of identical dimensions. The...

Hello bikerray, Thank you for your advice, tightening the nut at shaft end solved the issue. I actually wanted to test just the motor without bottom assembly before putting it back in the housing and I thought the nut would only hold the spider. Everything is fine now. Thank you again.

Good morning to everyone, this is my first post on this forum. I have been a happy owner of Rainbow D4C SE since 1997, which now I overhauled for the first time. Replacing bearings and brushes was part of the work. While putting the motor back together, I followed both the technical drawings and...