On my 2000 yz 80, when it slips like it would with a bad chain or a bad sprocket, could it be my engine?

Question

on my 2000 yz 80, when it slips like it would with a bad chain or a bad sprocket, could it be my engine or my transmission?

Answer 1

If you hear metal against metal noise, the transmission would be suspect.

The clutch is easy to check.

Remove it and check the friction plates thickness'

Get the specs from the service manual.

http://www.motocom.com/motorcycles/

Answer 2

I would take a hard look at the clutch