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Sluggish Mercrusier

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Gudmundur

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In article .com,
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My wife and I bought a 2000 Doral 250se with a Mercrusier 454. This
boat has only 67 hours and has not been used in two years. The boat has
been winterized by a local marina. This is the only service that's been
done to it. When driving it to another marina, it seemed a little
sluggish. We were able to plane in about 20 sec. and reach a speed of
42 mph at 3/4 throttle.(3400 rpm) However, with 5 people on board, we
could not plane at all. The best we could do was about 8 knots. We
tried trim tabs and looked for weeds or obstruction on the outdrive.
The engine seems to run very smooth in gear, at idle, up to about 1400
rpms. When 3/4 throttle was applied, the engine seemed to work hard.
(about 3200 rpm). Full throttle didn't change a thing. What are the
possible concerns or problems?

Thank you for any help, Ron

Sounds like to much pitch on the prop for the heavier loads, backed
up by sounding like your top RPM's seem a bit low, this would indicate
to much pitch, late ignition timing, or a dropped cylinder due to
one or two cylinders not firing. Above 1500 RPM it is hard to tell if
a cylinder is not firing, but with a dead jug, they usually lope real
bad at idle.

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