Fellas,
So I finally got my 87 Donzi ZB21 running well and went for the first WOT test run. A little background: The engine (Merc 350, afb carb, edelbrock intake) was a rebuilt last year that suffered a bad intake gasket allowing water to get in. Caught it early, did about 4 oil changes and all new top end gaskets and now she's running great.
So I took her out to some smooth water with myself and my wife in the boat and put the hammer down. With the trim up to a safe position I can only achieve about 4100 rpm. I believe the prop is a 23' clever and the original prop on the boat. Any ideas on the limited rpm? I think it might be running a little rich but otherwise runs great. My old merc 3.0's could muster 4700 rpm, but is this normal for this kind of engine combo? Outdrive is an alpha.
Thanks,
Matt
87' ZB-21 "She Gone"