Don't know much about I/Os so can't speak to your question about that... but those pics might get you some decent help at thehulltruth.com. Lots of folks there with I/O units, I think.
Common issues with I/O
boats are:
- is it the preferred freshwater cooled or
raw water cooled (salt
water within the engine block) system?
- wet slips aren't great because the outdrive usually can't be lifted far enough out of the
water. (Compare to outboards.)
- risers and sometimes manifolds (engine dependent) should be replaced periodically (some say every 5 years max) and you can't inspect that from the outside because any corrosion will start from the inside out. (IOW, depends on seller's
service records)
-Chris