I would look for signs of corrosion, check the compression, and look for
water in the lower end.

Does it start easily? Does it pump water?

That's what I'd look for.
Jim

Vødkäjéllÿ wrote:

Hi group

We are buying a second hand 9.9 mariner 2 stroke (it's about 3 years old)
for our 11ft Rib. Have been reading the messages in here and found lots of
info on the above model, but please could anyone advise us of what to look
for ie potential problems when opening it up?

Please respond, this is a genuine inquiry, and I will be replying!

Thanks in advance

A complete novice!