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Had a similar problem with my Mariner engine, same as Merc, suggest you flush out the engine in a large tub of fresh water and mix some SALTX solution in the water at the given mixture.
See link here http://www.salt-xuk.com/
Run it then stop and wait, run it again and stop it, repeat this over 2 -3 hours and you may well find it makes a huge improvment to the tell tail. Sounds like if the engine has some corrosion build up if not regulary flushed in fresh water after each trip.
Hope it helps
Dave
:boat:
See link here http://www.salt-xuk.com/
Run it then stop and wait, run it again and stop it, repeat this over 2 -3 hours and you may well find it makes a huge improvment to the tell tail. Sounds like if the engine has some corrosion build up if not regulary flushed in fresh water after each trip.
Hope it helps
Dave
:boat: