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#1
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Eegs2k, I am a fellow Fisherman 18 owner.
I would expect around 30mph with that 90hp. I run a 130hp on mine and have maxed out at 42mph, that was with the current and the wind. I cruise around 30mph. My boat is the same way with the water coming up through the deck drains. The floor is right above the water line so it is normal for it to happen. I second the check valve idea. I haven't added them to mine yet but plan to soon. Moving the battery should help a little. I would be completely smitten with my boat if it had a 25in transom. I venture about 10 miles offshore regularly and those extra 5 in would make me a lot more comfy.
__________________
84' Wellcraft Fisherman 18 / 96' Evinrude 130-Sold 20' Fisherman project underway www.ParkerFenceandDeck.com 
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#2
04-06-2010, 05:24 PM
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Thanks for the replies.
I think the prop is 14R 19. Does that sound right for a late 90s Johnson 90hp? I don't have a tach, so I cannot see RPMs. I suspect it is just a bit under powered with a 90 as Curapa said. Max hp is 150 according to the sticker. Would another prop make a difference? Does anyone have a link to the drains with check valves?
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#3
04-06-2010, 07:34 PM
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__________________
84' Wellcraft Fisherman 18 / 96' Evinrude 130-Sold 20' Fisherman project underway www.ParkerFenceandDeck.com
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#4
04-06-2010, 09:01 PM
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Prop can make all the difference in the world!! I was pushing a 5000 pound boat with a 175 Merc, after a few prop try's I used a 15 x 15 1/4 and could do 33 MPH before that I had a hard time getting out the hole!
Good Luck
__________________
1986 V20  Old Fishermen never die, we just SMELL that way!!
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#5
04-07-2010, 05:46 AM
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Quote:
Check the hose inside diameter on your boat prior to ordering...sometimes things get changed...
__________________
'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha 
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