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1996 Montauk repowered with Yamaha 70 Four Stroke
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| madmax79 |
Posted on 10/19/11 - 5:09 PM
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After owning our 1996 Montauk 17 for 6 years I had almost given up on it. There were problems every year with the original Evinrude 90 2-stroke and it was becoming more work than fun to own.
My wife loves the Whaler (looks, layout, handling) and she wanted to fix it up but I was sick of it. I looked at new boats and was close to a deal on one when I found a good price on a new Yamaha 70 4-stroke. My wife was glad and I obliged (spending 1/3rd of what a new boat would cost).
I've had it in the water 3 times since the swap and am still breaking it in but I now have a renewed love for the Whaler. It runs so quiet and smooth and barely uses any fuel compared to the old 90.
I haven't run it WOT yet but will be sure to add an update when I do. Pics of the old and new setup are in my personal page.
Edited by Joe Kriz on 10/20/11 - 12:28 PM |
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| DennisVollrath |
Posted on 10/20/11 - 9:06 AM
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Hi Max,
I'm very interested to know how you like the F70 on your Montauk. I am planning on moving one from my 15' sport onto a newly acquired '88 Montauk. I really love the motor, and hopefully it will suit the boat well.
Dennis
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| thegage |
Posted on 10/20/11 - 12:10 PM
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I'm interested in this as I think I'm going to have to do something about my '92 Johnson 90 in the off-season--whether to have someone go through it and rebuild as necessary or to source a new engine. Frankly, I'm not too enthused at the idea of spending what a new motor costs.
John K.
John Kittredge
1991 16 SL - 2013 E-TEC 90 |
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| Joe Kriz |
Posted on 10/20/11 - 12:34 PM
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When you say "New" is this the newer version of the Yamaha 70 Four Stroke that is lighter than the previous version?
Is this a 2011 model? or?
The new version weighs in at 257 pounds. I am not sure what the prior version weighed.
http://www.yamaha-motor.com/outboard/.../home.aspx
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| Tom W Clark |
Posted on 10/20/11 - 12:39 PM
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Joe -- There is only one Yamaha F70. It was introduced last year.
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| madmax79 |
Posted on 10/20/11 - 1:02 PM
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Yes, brand new. The dealer had ordered two; one for a customer and one to put in the store stock.
So I bought the one that wasn't accounted for and he gave me a good trade-in on my evinrude that had waaaayyyy low compression in one cylinder.
I'm trying to run it at least every other week for a couple hours so I should have the break-in done the first weekend in November. I'll give a full report then.
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| bmw90w |
Posted on 10/20/11 - 1:54 PM
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Im also interested in performance. I am finally gonna chunk my 96 merc 90 this offseason. I had it completely rebuilt and it runs great, but I want a 4 stroke!
1984 Montauk |
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| Joe Kriz |
Posted on 10/21/11 - 10:04 AM
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Thanks.
I was thinking about the Honda models that have been getting lighter than the previous versions...
This Yamaha four stroke weighs almost identical to my old 1985 Evinrude 70 two stroke.
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| madmax79 |
Posted on 12/18/11 - 7:39 PM
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Well, here's a mini-update; after the break-in period, we've opened it up a little and it doesn't jump on plane quite as quick as the 90 but it cruises just fine and feels like there not a loss of speed. The main test was pleasing the commander in chief (my wife) and she hasn't complained one bit.
When I finally remembed to get my gps out of the Jeep so we could test the top end, the gps was dead. So I asked Santa for a new gps for christmas. If that comes thru, I'll post results.
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| hilyert |
Posted on 12/19/11 - 8:08 AM
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I am now in the same boat so to speak. My 17' 88' Montauk had an old 75 Johnson. I was going back an forth with the dealer, I wanted to repower with a 90hp 4-stk Yamaha, he talked me into putting the 70hp 4-sty Yamaha on it.
All I can say is WOW, how quite, only have 2 hours on it breaking it in. We had quite a chop in the bay but it quickly got up on plane. In two hours it did not burn any gas so to speak.
We're going to love it.
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| madmax79 |
Posted on 12/19/11 - 3:01 PM
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I forgot to mention how quiet it is. The first time I fired it up I thought it wasn't even running  And, it sips so little gas it's like the Prius of the river.
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| bmw90w |
Posted on 12/19/11 - 8:21 PM
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You guys are making me jealous! I need to sell my old merc and get one of those.
1984 Montauk |
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| Karlow |
Posted on 01/01/12 - 10:08 PM
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Christmas is over!
What did you get for the top speed?
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| merlotstone |
Posted on 01/02/12 - 11:22 PM
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Hi Madmax! How much did you pay for it? I'm thinking getting one for my 86 montauk
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| montauk88 |
Posted on 01/11/12 - 5:51 AM
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Hey Madmax or hilyert - any chance you've been able to get some speed results? Are you able to pull skiiers out of wather easily?
My 88 model Yamaha 90 2-stroke still runs good but I always worry about it - plus the thought of a quite, smooth, clean & efficient 4 stroke sounds good - assuming it doesn't sacrafice too much power. Hence the questions above =)
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| hilyert |
Posted on 01/12/12 - 6:34 AM
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I've only taken it out for the second time. Six total hours on it.
I don't have a speedo on it, but it ran up to 6200 rpms quickly.
Too cold to pull anyone skiing yet. It felt like 35 to 40 mph which is fast enough for me. I had two people total weight approx 325lbs.
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| Tom W Clark |
Posted on 01/12/12 - 6:42 AM
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I have a friend with a 2002 Montauk and a new F70 on it. He reports 38 MPH @ 6200 RPM using the 13-1/4" x 14" Yamaha Performance Series three blade propeller
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| Fishmore |
Posted on 01/12/12 - 6:09 PM
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Tom, those numbers did not sound right to me and when I put them in to the prop calculator I got a negative number for slip. I wonder if he is reporting his prop size incorrectly or if he is not running the published 2.33:1 gear ratio?
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| Tom W Clark |
Posted on 01/13/12 - 7:50 AM
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There is nothing unusual about negative slip calculations with the Yamaha Performance Series Three Blade propeller. This propeller is the same propeller as the Stiletto Advantage and the Turbo 1. All three are made by Precision Propeller Industries, Inc. which is now owned by Yamaha.
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| Fishmore |
Posted on 01/13/12 - 11:18 PM
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Tom, my experience with my Montauk using a Stilleto Advantage 19 pitch on a 75 HP two-stroke Mercury with a 2.33 gear ratio runs 38 MPH @ 5200 RPM it calculates out to +5.37 slip. While the Yamaha has a higher max RPM it has the same gear ratio as my Mercury, same prop style and hull style so I do not understand why running a 14 pitch prop and calculated -7.87 slip would be correct? If the Yamaha had a 16 pitch prop then that would calculate to +5.75 slip which I would definitely understand and what I would expect.
For clarification the numbers I used were:
5200 RPM / 2.33:1 Gear Ratio / 19 pitch / +5.37 slip / 38 MPH
6200 RPM / 2.33:1 Gear Ratio / 14 pitch / -7.87 slip / 38 MPH
6200 RPM / 2.33:1 Gear Ratio / 16 pitch / +5.75 slip / 38 MPH
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