Reply To: Johnson Seahorse 5.5 CD10 or C11

[Don]

Most all parts can be found for this engine, if not new, than used or “old new stock”.   I would start by checking the basics, like compression and spark.  Then I would drain and inspect the gear lube.  Have you had any experience working on outboards?

Another thing to consider is that you will need the two line pressure tank for this engine, do you have it?  If so, have a look inside to be sure it is not fouled or rusted from old fuel being left inside it for a long time.