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#1
08-24-2004, 07:43 AM
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repower
Hi everyone,
I just bought a 76 20 ft. cc, with a blown 175 Merc Black Max. The boat appears to be in great shape, the floor is very solid,gas tank was replaced in 91, the transom seems to be very solid.( I guess I wont know for sure until I take the old motor off). My question is does anyone know the weight of the Merc Black Max, I'm cosidering putting a Yamaha 150 four stroke on the boat but I'm concerned about the weight of the 2 motors being drastically different. Also is there any other way to check my transom prior to removing the motor? Thanks alot,Blackfin 
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#2
08-24-2004, 08:57 AM
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Re: repower
Your motor weighs 400-450 lbs.My boats in the shop having a 225 hp. optimax installed. I've got a 2002 200 hp. EFi for sale. Runs great, I'm in the Merc. pro program so I update my power every 2 years.
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#4
09-01-2004, 08:17 AM
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Re: repower
If the floor is original (height) and you don't intend to raise it, I would put the lightest engine I could find on there. A 130 Yamaha Saltwater Series 2-stroke will push those boats pretty good - it's what mine had before the redo and they aren't real heavy.
A 150 four stroke Yamaha, for the 20" shaft, weighs 466#s. If you have a 25" transom, that figure goes up in weight. If you do leave the floor where it is, and put a four stroke engine on there in that weight range, you WILL need plugs in your scuppers and it will not be a self bailing boat except when underway. Sadly, I know this from experience [img]/images/graemlins/frown.gif[/img]
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#6
09-06-2004, 02:43 PM
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Re: repower
Thanks guys, I don't want to screw around with th self bailing system, I'm going to look into a two stroke, or possibly the four stroke suzuki 140 it's supposed to be pretty light. Would a 115 be enough H.P. for the 20 C.C.? I've heard mixed reviews.
Blackfin
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#7
09-19-2004, 03:28 PM
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Re: repower
115 would not be enough, stick with 2 strokes for weight and there is not much adavantage to 4's with the new ones, 140-150 is fine, I would think you would rarely find an opportunity to open up a 200 or 225
__________________
Any way you measure it - dumbass is expensive
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#8
08-25-2004, 09:57 PM
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Re: repower
A 1994 Merc 150 carb 20" motor weighs 406 lbs, according to an old brochure I have.
__________________
Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes. Fr. Frank says: Jesus liked fishing, too. He even walked on water to get to the boat! Currently without a SeaCraft  (2) Pompano 12' fishing kayaks '73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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#9
09-01-2004, 11:25 PM
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Re: repower
Mako 23, check your P.M.
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#10
09-04-2004, 08:04 PM
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Re: repower
A friend put a 225 opti on his 20,BIIIGGG mistake. Like Mark said plugs have to be in all the time when anchored or docked. In my opinion I would not put anything back there that would hurt the self bailing.
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