Agree!......stay with the motorcycle specific oil!.....go over the entire machine and check the bolt's and nut's torque...clean and lube the chain etc.....get a service manual and follow it!!.
If the bike runs fine there is no point in taking apart the carb. You can do the service yourself following instructions in the Service Manual.
With 600 miles you'll need a motorcycle-specific dino-based oil. Newer types of some oils can damage your bike.