I would say bearings, too. But most likely, they are sealed, and cannot be lubed. You may be looking at replacemnt of the bearings.
Ya,
those motors have ball bearings and when it stops its time to buy a new motor.Kragen has the for $30 bucks i think it is a four seasons motor.I have tried to lube them and never works.I wish it would work because i have about 8 of them that froze up.
Cliff