by Ray » Sun Jul 18, 2010 3:48 pm
That sounds strange.
Be sure to check the condition of the bottom of your hull.
Growth on the bottom will affect your speed.
There might be a screen somewhere under the cover, but the main filter should catch most trash.
An engine shop should be able to put it on a computer and find anything wrong with it pretty quick.
If it wasn't the engine, it would be the hull or prop.