Absolutely, positively bring the outboard back to the dealer. You want to
have this problem registered as being a problem after only 20 hrs.
Hopefully they will be able to correct the problem, but if they say they
could not duplicate the problem, you still have a paper trail showing the
problem.

This will help if you need to get "warranty work" completely, after the
warranty period has expired.

While there, have them complete the 20 hr. check up.


"Tom" wrote in message
...
I have a new Yamaha 200 (ox66) outboard with just 22 hours on it. The
other
day I took it out and noticed a slight metallic rattling noise while it
was
idling, seemed to go away after a few minutes, then while running about
3600rpm's I heard a loud thud coming from the engine, no change in
performance just a loud thud... I stopped and checked everything over and
then continued, every so often we would hear this same noise..can't find
anything obviously wrong..just looking for some ideas before I take it
back
to the dealer. Thanks... Tom