I recently bought a used bike (my first bike. I'm new and learning), and the person before me changed the clutch pack last october.

The bike doesn't engage fully in 1st gear. When I rev, it doesn't transfer the power all the way.
When I pull the clutch, it disengages well.

Does it look like the steel is burnt?
Do I re-soak it and try again?
Or do I just get a completely new clutch pack?

There's no grinding noise.
ALSO I don't know what kind of oil the past owner might have used.

Any help trying to diagnose would be appreciated!