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  100 HP, 4 stroke YAM, 90 HP, 4 storke MERC

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Author Topic:   100 HP, 4 stroke YAM, 90 HP, 4 storke MERC
shipwreck8 posted 05-13-2002 01:44 PM ET (US)   Profile for shipwreck8   Send Email to shipwreck8  
Hi All,

I have a 1976 Newport 16'7 I am thinking of repowering with a 100 Yamaha 4stroke, or 90 HP MERC, (The engines are very similar).

Has anyone done this with either engine and can you tell me the pro's and con's from your experience?

Thanks shipwreck8

tabasco posted 05-13-2002 01:51 PM ET (US)     Profile for tabasco  Send Email to tabasco     
Both motors are 95HP
Don Fisher posted 05-13-2002 02:09 PM ET (US)     Profile for Don Fisher  Send Email to Don Fisher     
My Dad just put the Yammy on his Montauk. That motor has been flawless (unlike the 115 fuel injected 4 stroke Yammy he had on his Dauntless). We can troll all day with the 100 with no problems. Great motor!
Soho posted 05-13-2002 02:20 PM ET (US)     Profile for Soho  Send Email to Soho     
I decided against the 4 stroke from the perspective that the extra weight would probably be a negative factor on my 69 Nauset. ( my opinion, others may fee different ) In addition, the extra cost of the 4 stroke was not going to pay off in any reasonable time in terms of fuel savings. Having said that, had the weight not been a consideration, I would have gone with the 4s for less noise and smoke. Free advice - take it for what it is worth...
Bigshot posted 05-13-2002 03:09 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
1976 had 2 different designs. Do you have the smirk whaler with the triangle shaped front hatch or the older design with the rectangle hatch?

reason being if smirk then the weight is less noticable, the older is much lighter and will have more adverse effects.

You may also want to consider the 70 Zuki/Johnson 4 stroke. I get almost 40 and burn less gas. If 3+mph top end is that important then consider a 90+hp.

jstachowiak posted 05-15-2002 10:42 PM ET (US)     Profile for jstachowiak  Send Email to jstachowiak     
I have a '79 Newport and I'm considering a 90 Merc 4-stroke. Both Yamaha and Merc are the same power head. See forum and see motors. There is alot of discussion there. Boils down to service. There are dozens of Merc dealers all over, so I'm leaning towards Merc. My Newport has a '79 90 HP merc. so bolting up another Merc will be no problem.
jbtaz posted 05-16-2002 02:19 PM ET (US)     Profile for jbtaz  Send Email to jbtaz     
Personally, I would get the Merc due to dealer access and speaking from experience of being a Merc 4 stroke owner-I love it.
lhg posted 05-16-2002 03:55 PM ET (US)     Profile for lhg    
My Mercury/Yamaha Dealer recently told me that he is recommending people wait for next year's 75 and 90 4-strokes, as they will receive the EFI system. He thinks the EFI 115's of either brand are superior equipment to these carbed engines. Evidently, carburated 4-strokes are soon to be a thing of the past, at least in the Mercury line-up. So if you're not desperate for a new one, you might wait.

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