buying new motor

sym

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Joined
Jul 10, 2002
Messages
20
Aloha, <br />I am planning to replace my77evinrude(m#75ELR775,s#J4752175)70 hp(2-stroke) and was wondering which motor to buy.It is going on a 14 "fiber-form",semi-v,cuddy cabin type boat.Used for both inshore and offshore trolling.Dont know weight of boat.It is heavier than a 14 bouston whaler.I dont know what it is rated for.Im willing to go smaller if a 70hp is to big.Top speed is not important.I was looking to get a 4-stroke for better MPG(suzuki or honda).<br />~Thanks, sym
 

JB

Honorary Moderator Emeritus
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Mar 25, 2001
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45,907
Re: buying new motor

I have been very happy with my DF70 Suzuki, Sym. It might be a bit heavy for your 14', though.<br /><br />I would make a serious effort to learn the hp rating for your boat. If high speed isn't a priority you might be better off with the much lighter DF50.<br /><br />Another option is the Merc EFI 60hp 4 stroke.<br /><br />I would shy away from a carbed engine, just because of the greater user friendliness of EFI.<br /><br />Good luck. :)
 

sym

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Joined
Jul 10, 2002
Messages
20
Re: buying new motor

Thanks for the quick reponse.Very useful.<br />~ Aloha,sym
 

sym

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Joined
Jul 10, 2002
Messages
20
Re: buying new motor

Jason, thanks for the link.I tried the formula and came out with 59.8.My formula was:<br /><br />14lenth x 5.35 transom width= 74.9=factor<br /><br />since its over 52.5 and with remote steering:<br /> <br />(2 x 74.9)-90 =59.8=max HP rating<br /><br />Does this look right?<br />Thanks again! sym
 

bossee

Senior Chief Petty Officer
Joined
Jul 18, 2002
Messages
727
Re: buying new motor

Hi,<br />Probably the closest You can come in performance and weight for a new 4-stroke today compared to Your present 70 hp 2-stroke is:<br /><br />- Mercury EFI 60 (Electronic Fuel Injection so no carburators), CARB 3-star rated. Weight 112 kg/246 lbs.<br /><br />- Yamaha F60 (carburators - CARB 3-star rated also for 2004 model despite carburators). Weight 111 kg/244 lbs.<br /><br />In the 70-75 hp 4-stroke range You will probably find these to heavy for Your boat:<br />- Mercury 75 4-stroke (carbs) 175 kg/385 lbs.<br />- Mercury Optimax 75 (Direct Fuel Injected, no carbs) 170 kg/374 lbs.<br />- Yamaha F75 (carbs) 168 kg/369 lbs.<br />- Honda BF75 (carbs) 169 kg/373 lbs.<br />- Suzuki DF(60-)70/Johnson (60-)70 4-stroke (EFI) 152 kg/335 lbs.<br /><br />Since any 50 hp 4-stroke (Yamaha F50, Mercury EFI 50, Honda BF 50, Suzuki DF50/Johnson 50 4-stroke) today is at about same weight as most 60 hp 4-stroke (Yamaha F60, Mercury EFI 60) I would, if economy permit, select any of the two 60 hp 4-stroke mentioned.<br />With Yamaha You get the extra benefit of 3 year extra warranty if You buy before March 31:<br /> http://www.yamaha-motor.com/products/otb/promo_yes20103.html <br /><br />I do not know if Mercury has some similar offer.<br /><br />If You have a good Mercury dealer/service center near You I suggest a Mercury EFI 60.<br />If You have instead a Yamaha dealer/service center near you I suggest a Yamaha F60.<br />If You have both, just select any of these 4-strokes You like better, find for a lower price, better warranty etc.<br /><br />If You really want a 70-75 hp 4-stroke, probably a Suzuki DF70 or Johnson 70 4-stroke (same outboards) is wise to select because of excellent performance, quiet etc and is the lightest 4-stroke in this class. But I think it still is little to heavy for Your boat, after all 14 feet long/ 4.27 meter is not a large boat, personally I would not hang a 150 kg/335 lbs outboard on such a small boat.<br />Suzuki also has a 6 year warranty offering until March 31:<br /> http://www.suzukimarine.com/showsanddeals/gimme/gimme_six.php <br /><br />Regarding performance, fuel efficency, noice etc both Yamaha F60 and Mercury EFI 60 has proven themselves in outboard tests to be very good. I would not hesitate to buy any of them.<br /><br />Since You have an Evinrude already I suppose the new Evinrude E-tech 60 hp 2-stroke can be an alternative also. But You said 4-stroke so I guess this is not an outboard You have considered then, and the new E-tech has not been used by many users yet so it is difficult to say how reliable it is. E-tech seems good on specifications alone but personally I would hesitate to buy one this early, later when it has proven to be as good as Evinrude say (hopefully) it will be easier to make a decision to buy or not.<br /><br />I use a Yamaha F115 4-stroke myself.<br /><br />Good luck!
 

jklett

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Joined
Nov 19, 2003
Messages
29
Re: buying new motor

Your math is correct, USCG says 60 horsepower max. Another thing to think about is that today's 2 strokes(EFI) get much better feul economy than the older ones(carbs), since that seems to be the main reason for your wanting a 4 stroke. Plus they're lighter than 4 strokes in the same power range, a big thing with a narrower transom like your boat has. Less weight= less fuel consumption also. Good luck.
 
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