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ContinuousWave: The Whaler GAM or General Area
100 HP, 4 stroke YAM, 90 HP, 4 storke MERC
|Author||Topic: 100 HP, 4 stroke YAM, 90 HP, 4 storke MERC|
posted 05-13-2002 01:44 PM ET (US)
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?
posted 05-13-2002 01:51 PM ET (US)
Both motors are 95HP
posted 05-13-2002 02:09 PM ET (US)
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!
posted 05-13-2002 02:20 PM ET (US)
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...
posted 05-13-2002 03:09 PM ET (US)
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.
posted 05-15-2002 10:42 PM ET (US)
I have a '79 Newport and I'm considering a 90 Merc 4-stroke. Both Yamaha and Merc are the same power head. See www.iboats.com 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.
posted 05-16-2002 02:19 PM ET (US)
Personally, I would get the Merc due to dealer access and speaking from experience of being a Merc 4 stroke owner-I love it.
posted 05-16-2002 03:55 PM ET (US)
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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