Need Help 24' Superboat
I just bought a 2000 24' Stepbottom Superboat with a 225 mercury promax just rebuilt new pistons and cranks and new lower unit.
I took it out for the first time today and something is wrong because with myself and 4 others our max speed was 43(GPS). The boat had 30gallons of gas in it and I would think we would reach about 60mph. The racing unit was replaced by a non-racing lower unit(talked to John coen and he said this shouldnt change the speed). The rebuilt motor has about 2 hours currently on it. Anyone have any idea what's wrong? |
You have to let us know what rpm at wot (wide open throttle) and what prop are you spinning before you could get any help.
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about 6500rpm at wot and spinning a Michigan wheel Apollo xhs A series
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did you change the engine height? the change of lower unit will have an affect on speed if it has a different gear ratio. what pitch is the prop?
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i thnik a good prop might help not sure about it getting you 17 mph what kind of speedo you running gps?
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Definatly a Prop/Gear Ratio problem, You have plenty of rpm, Now you need to convert in to forward motion.
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Thats what I am figuring....if that engine is spinning up to 6500 rpm that means it is generally healthy...the hub might be bad in that prop or you dont have enough prop. Do a search on outboard 24x7's and see what guys are using for props. That should give you a baseline. Scream and fly might have a tad bit more info on the outboard performance boats.
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prop pitch is 14x22
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Those Boats Dont Like The Extra Weight ,Meaning 5 People And 250 Lbs Of Fuel Try Running It By Yourself And See What The Speed Is ,,And A trophy plus Prop Works Best On That Boat
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