The main drive gear is slipping. This is caused by etiher worn teeth or worn bearings. If you pass the model number I can show you a diagram of where to look and what part or parts that have most likely failed. The drive gear is the weakest link but the motor can be shifting in the housing away from the drive gear. It only takes a bit less than 1/8 inch side play. The model number will be similar to this 358.341160
Most likely it is item 26 of this diagram:
http://c.searspartsdirect.com/lis_png/PLDM/P0101241-00001.png
This example is for model 358.381160
http://www.searspartsdirect.com/partsdirect/part-model/Craftsman-Parts/Chainsaw-Parts/Model-358341160/0247/1503210/P0101241/00001?blt=06&prst=&shdMod=
Thanks for choosing FixYa, Kelly
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