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I finally got a new engine, a F70 and I love it. She runs about 33 at 6200 rpms and plenty of power for what we do. It is mounted 2 holes up, the blind holes filled and repaired. I discussed the mounting with the shop and they are now doing another Montauk the same way. I told them I would not charge them for teaching them about installing engines. Thanks for all the tips.

Here's a picture of her after a fun afternoon on Lake Greenwood.
https://www.flickr.com/photos/1570000...ed-public/

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Very nice - - congrats!

That F70 seems like a good match to the Montauk hull. Your stern is floating high on its waterline!

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I've had the F70 on my War Eagle for 3/12 years and love it! I am debating between it and the F90 for my 1988 17' Montauk. The F90 is almost twice the displacement.

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A friend of mine in may 2019 had a Yamaha 70 (model number F70LA) outboard installed on his 1990 Montauk 17 boat. The total cost of the outboard and rigging was $11070.71. The labor charge portion to install the outboard and rig gauges, binnacle, control cables was $1305. The deal was "instructed" to mount the F70 3 holes up; they did not do it that way. Cruising performance is ok in my friend's opinion. Full throttle speed is about what Midlands-Montauk experienced with his Montauk 17: 33mph at @6200rpms. My friend is running a Yamaha aluminium propeller, 13 5/8 X 13 (part number 6E5-45949). I never heard back from him when I asked for a photograph of how the motor was mounted to the transom. Personal opinion: more than 11K expense for a repower with a mediocre outboard performance result on a Smirked Montauk 17 is way too much money/Expense.

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Say what you will but I like my engine and that is the only thing that matters.

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$11k for a 70 mounted???? Most shops by me charge #$350-500 to rig an outboard. I can buy a new F150 for around $11k.

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Midlands, enjoy your new engine, it is one of the top 2 picks for the 16/17 ft vintage hulls, the other being an eTec 90.

There is a lot to be said for having less weight on the transom of these small light boats, and they perform very well with 70 hp.

The Yammie F70 isn't cheap, often costing as much as the eTec 90. So what? I know that and I am still on the fence about which one to buy. Those hulls with less weight perform better, and are just about the best boat ever made.

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Thanks MG56, I do like the F70, it's quick enough, handles well, sips gas, and makes resale, if I ever do decide to sell, much easier.

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It's time for a repower of my 1970 Sakonnet. I've read all this thread and others I could find. I have been studying the F90 and the ETEC 90 ... Am I reading that you all might consider the F90 too heavy/much for the vintage 16-foot hull? I have been leaning towards the F90, but should I reconsider? I have also seen a few negative comments about the ETECs and hardly any about the Yamaha's -- I have both dealers nearby and both have great reputations. The Evinrude mechanic has been great helping me keep this 1984 VRO 90 alive ... until it died for good last Thursday ... 10 nm from the pier :(

Thoughts?


(changed to Full 4 digit year per guideline #1 at the top of this page)

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I had a 70 Suzuki on my 1986 Montauk and was very pleased with the performance. Set up correctly it would do 38+. I personally thought it was a perfect match as I do think the 90's might be a tad heavy on a classic and the e-tec 90 will only fetch a couple MPH more than my 70 would.

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I know this discussion is about new motors but I will share this. I own a 1966 with a Yamaha 90 2-stroke and a 1964 with a Yamaha 70 2-stroke.

I am totally happy with the performance of the 70hp. The 90hp screams and I almost never open it up unless alone. If the f90 is a good bit more weight, I would probably go with the f70.

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I remember when you got that Suzuki. Wasn't that one of the first four strokes, and didn't that weigh like 350 pounds?

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Lots of apples and oranges being compared here in the thread. We started with a guy who bought a 4 stroke gray motor and installed it on his Montauk 17. Then a guy with a completely different boat, a Sakonnet 16, asks if a 90 four stroke is too much weight for his 16 hull. Stovebolt, maybe you should start a new thread asking for information about the considerations for installing a Yamaha 90 four stroke on your 16 hull.

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Roger that. Actually, I got a lot of useful info I needed for my decision in this thread. It was helpful to me as I'm sure it will be to anyone else considering a repower on a similar hull. I don't concur that the Montauk and the Sakonnet are "apples and oranges," though -- especially for a "repower" discussion. A couple of weeks ago, we parked a Montauk 17 (like the OP's) and my Sakonnet next to each other and they looked pretty similar to me ;)

FWIW, I went with the ETEC 90. Should be here next week.

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Dear Midlands Montauk,

I am happy to hear that you are enjoying your new Yamaha F70 on your Boston Whaler Montauk 17. The Yamaha F70 is a great little motor. My family just put the same outboard on our 1984 Boston Whaler Classic Sport 15 this past July. We don't have anything bad to say about the Yamaha F70. It, actually, goes into the shop later this month to get its first 20 hour service.

I am curious as to what kind of fuel consumption you get with the Yamaha F70 on your Montauk 17. We have not had a hell of a lot of time to use our Whaler with the new outboard. From what I have observed, it uses a little less than 2.00 gallons an hour. This is at varied RPMs.

Thanks in advance for all replies,
Paul