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Post Posted: Wed Feb 08, 2017 4:16 pm 
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So on my 1988 Aquasport 170 I have a 1989 Johnson 70hp vro. I have a guy that wants to trade me a 1988 Evinrude 88spl. Straight swap no $ involved. Both run. Sound like a good deal? Any thoughts or opinions?

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Post Posted: Wed Feb 08, 2017 10:22 pm 
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1989 70hp weights 250 and is 3 cyinders, sips fuel and has 3 carbs
1988 88spl weights 288 and is 4 cylinders Crossflow, VERY thirsty yet proven design with 2 very large carbs

The 70 is lighter and will give you better fuel mileage than the 88. The 88 (its probably around 100 or so hp) is a proven design and was made for well over 40 years as to some variation. If it was me that 20hp doesn't make much difference other than a few more mph top end and 38lbs is more fish/bait/beer/babes, etc I can carry on her.

If you run a compression test on all cylinders on both motors, and all being equal, it will be a gut call. Do you want another cylinder? I do know that the 70hp Evinrude/Johnsons are a proven reliable design. I would wonder why the guy would want to swap backwards?

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Post Posted: Wed Feb 08, 2017 11:33 pm 
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I have a 90hp 60 degree on my 170. Love it. I would not want anymore weight than it back there. I'd consider it.

I agree with Kevin, why does he want a smaller motor?

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Post Posted: Thu Feb 09, 2017 12:41 am 
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He bought the boat with this engine. It is a 17 ft Lowe John boat and this engine is over his HP rating and he says weighs too much.

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Post Posted: Thu Feb 09, 2017 11:44 am 
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I agree with Kevin... The 70 is a great motor.. The only reason to swap IMO would be to look at the 88 and see where that block falls in the HP bracket, is a 120 on the same block with different carbs, intake and exhaust plates? What would be the cost/effort etc to tune the 88 up? There is no replacement for displacement, but what do y'all really want to do? Just up to an 88 from a 70 isn't worth the weight unless there is a big enough difference in the torque curve where you want it, and not having done homework on the motors in a while, I am no help there....

From previous boat lives I will say that the 3 cyl block is bullet proof.. If you want another carb pack I have one from a dead motor I picked from the roadside (PO was an AHole and ran it no oil)..

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Post Posted: Thu Feb 09, 2017 2:17 pm 
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I'd keep the 70. Best engine OMC ever made IMHO. So good that Yamaha duplicated it as the 90. Tohatsu too.

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Post Posted: Thu Feb 09, 2017 3:24 pm 
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Thanks for the input! So from everything i am reading it sounds like the 70HP should stay. I was telling momma about the possible trade. And her response was yeah more horsepower but an older engine. You may as well get a newer one!!! If that doesn't sound like permission to do some shopping i don't know what is! Sound like permission to get a newer one to you?

So i did some quick looking for something newer to show her. And these 2 came up:
1. 2012 Tohatsu 90HP TLDI with 25 hours and all the wiring and controls for $4600 and weighs 337 lbs
2. 2010 Evinrude ETEC 115HP with 217hours comes with all the wiring, controls, stainless prop, binnacle control, digital i-command gauge and the oil tank but weighs around 375 lbs. Asking $4500

Which would be the better engine for my 170?

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Post Posted: Thu Feb 09, 2017 5:09 pm 
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Im a huge fan of tohatsu. i had a 9.8 that i rode hard. i put about about 500 hrs on it in 2 years and gave me one issue the entire time. stupid magnetic pick up for the ignition got corroded out. your motor now is about 250lbs. both motors add a lot more weight off the ass end of that boat. it might be enough that your scuppers would be under water or close to it.

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Post Posted: Thu Feb 09, 2017 6:45 pm 
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Yeah weight is a big difference. Since I am redoing my transom. Maybe i could wait and see how low it would sit and go from there! Raise the floor and scupper drains. Who knows. Decisions decisions decisions

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