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I did a "Mid season" P.M. routiene on the boat 3 weeks ago all filters and upper and lower oil changed, the shop also did a complete carb rebuild in early May (Gotta love the E10 fuel) so plugs, timing are all good. The tank of fuel was very fresh as I buy fuel at a local station that has a high volume.
The motor is a 2005 and has 75-100 hours on it, the speed testing was done in both directions on the bay. Wind was 8 knots out of the north and I was sitting, motor trim was properly adjusted for optimum speed.
Yeah I know about those variables but nothing much has changed that I can see that would drop the top end like this, I suspect that it might be the prop slipping but I can't test that till I get back out on the water.
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