I have had a similar problem with a couple Remington electric chain saws, including this one. I removed the motor, opened it up, and found the problem was burned out motor brushes. It can be quite a challenge finding replacements.
MAKE CAREFUL NOTE OF HOW ALL COMPONENTS FIT TOGETHER AS YOU DISSASEMBLE.
I took the motor with me and ended up finding some brushes with the same cross-section at a local electric motor repair place. I tried completely replacing the used brushes before, but always had trouble with either opening and re-closing the brush holder, or with trying to make connections to the existing wiring.
My most effective solution was to file the end of the burned out brush flat (it wears to a curve that fits against the comutator). Then I cut a piece of a new brush with the same cross-section as long as would fit inside the brush holder when inserted from the comutator end to replace the part that had burned/worn away.. I ended up with a piece between 1/4 and 3/8 inch long. This fits flat end to the filed-down flat end of the burned out brush.
Once carefully put back in place and reassembling the motor and saw, I ran the motor with no chain for a minute or so to verify the fix and give the brush a chance to shape itself to the comutator.
This is not necessarily a permanent solution. But I can repeat the process as often as needed until some other component wears out enough to justify replacing the entire unit.
I really like NOT messing with gas engines and do a lot of heavy cutting on logs moved nearer to the house.. But the weak link on every electric I have had has been the brushes eventually burning away.
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