As an EX. yammie techie I can say you have been "HAD". The dealer will put
the correct prop on it (he has dozens of extras for just such a need) and
charge you for water in the gas He probably put in the boat. If it was not
mis-firing-it did not have water.



Didn't the original post say that he was originally getting 4400 (or so) rpms,
and that after a couple of trips the rpms dropped to around 3200. I'd say
something was misfiring.

And I can assure you that on a fuel injected engine small droplets of water can
be mixed with the gas and get through the filter can and will cause premature
fouling of the plugs. It doesn't take much for a new lean burn engines to not
properly fire. Not usually a problem on carb'ed engines where fuel /air mixture
is not so critical.

If they change the plugs and clean the fuel tank and them tell him he needs to
go down in size on his prop, I'd say he probably hasn't been "HAD". He should
thank the dealer for solving the problem before he did serious damage to his
new engine.

I'd also suggest that he find out where the water's getting in or it will be a
continual problem.

In case you're wondering, I went through the exact same thing with my 200hpdi
Yammy last year. Turned out water was entering around the fuel sending unit and
at the fille neck O-ring. They pumped 6 gallons of water out of my tank and I
was there to see it.

Barry