I have a 1990 Mariner 55EL 663 that has been on freshwater all it's life. I am not sure of it's service history and want to service it. I have trawled the web for service parts but there seems to be very little for this model still available. The manufacturer plate says "Made in Japan" and I have been told that this was a Mariner built by Yamaha. What is the equivalent Yamaha engine that I could use to order a service kit for my engine? I posted this on the Mariner/Merc forum but got no help - I'm hoping the Yamaha crew are brimming with knowledge! Thanks for any help.