DIAGNOSIS A slight warm smell from the motor and electronics is normal under heavy use, but a distinct, sharp electrical burning smell is not. That usually points to the motor or wiring overheating due to excessive load or a failure.
FIX Stop using the saw immediately and let it cool completely. The first thing to check is your chain. Is it razor sharp? A dull chain forces the motor to work way harder, generating excess heat in the windings. Second, check chain tension—a too-tight chain creates massive drag. Third, are you using the right battery? A small or old M18 battery can struggle to deliver current, causing the tool to overwork and overheat.
IF THAT DIDN'T WORK If the chain is sharp and tension is good, inspect the air intake vents on the saw (usually near the rear of the motor housing). If they’re clogged with sawdust and wood chips, the motor can’t cool itself. Use compressed air or a soft brush to clean them out thoroughly. A persistent burning smell after these checks suggests internal damage, like a failing stator winding.
HEADS UP That burning smell is the insulation on the copper motor windings cooking. Once that insulation breaks down, the motor is on borrowed time and will eventually short out completely. If a thorough cleaning and proper technique don’t solve it, stop using the saw and contact Milwaukee service. Running it further could turn a repair into a full motor replacement.