My Mclane Trimmer lawn mower makes an odd noise?

The cord is wound around a pulley that is attached to the mowers crankshaft. Inside the pulley are some kind of bearings that allow the crankshaft to spin and not turn the pulley after the mower starts. You MAY be able to squirt some lubricant like wd-40 on the bearing and stop the noise, it may just be dry and need lubrication or one of the bearings is worn out and no longer rolling.You might be able to take a pulley off of a newer mower and replace it if it is bad.