I have a Black & Decker KS850 Circular Saw which was spinning sporadically so I have taken it apart to investigate. I think there may have been a loose piece of plastic that had broken off from the motor mounting but it doesn't look that important so I chucked it out. The motor is sat firmly in position.
I tested it and notice that it was creating large sparks and getting hot without being stress tested, as in, it was just spinning without being used to cut through anything.
Can you please tell me what you think is causing this?
I have included a video example.