Have you already carried out a pre-purchase inspection?
Inspected all the paperwork, made sure all ASBīs or SBīs or whatever are carried out?
All parts are serviceable and "Track-able"?
Have you opened all covers and cowlings, looked into all those dark corners?
The older an aircraft is, the more time you need to spend looking for snags....
The Bell 206 should take you at least 2-3 days to look into to make sure you donīt buy something not worth the money....