Take the motor outdoors. Spray the berrings with trichlor, or some other solvent. Brake cleaner is OK.
Let it dry a few minutes, oil the berrings with zoom spout turbine oil. Two cycle mixing oil is OK if you can't find zoom spout. But the little bottles make life a lot easier.
Let the flammable solvent dry out completely. reassemble, should work better.
turn off the suspicious breaker. plug saw into a different working circuit. does its breaker behave? is cord or plug overheating in use? is cord brittle or in need of replacement for any reason? examine suspicious outlet. are plug prongs loose or held firmly as new? after replacing suspicious outlet receptacle, plug a 1500 watt electric heater into the suspicious circuit and reset it, and try the heater. if circuit behaves, try saw. if saw or heater trips only the suspicious breaker, replace breaker.
Michael wrote:
Is the motor clean and oiled?
What if the blade is getting dull as it may need sharpening......
you could check actual current use with a clamp in ampmeter
harbor freight has them for under 20 bucks very useful around the home
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