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Author Topic:   repowering of 1978 Montauk
marc monreal posted 04-24-2001 09:11 PM ET (US)   Profile for marc monreal   Send Email to marc monreal  
I am considering re-powering my Montauk with a 70,90,or 115 HP engine from either yamaha or omc . Any info. concerning the plus's or minus's of these engines and probable performance would be greatly appreciated.
Eric posted 04-25-2001 05:49 PM ET (US)     Profile for Eric  Send Email to Eric     
I expect to see a lot of replies to this one. There's lots of brand loyalty in effect when the subject of outboards comes up, so it's always interesting to filter the opinion from the facts. I've got a left over 90 horsepower 1999 Johnson on my Nauset. Just turned up 20 hours today. It's been good so far, ask me in two years. I wouldn't bother with a 115, you'll risk some problems with liability for overpowering your boat. Max rating is 100 horsepower. My 90 moves my my boat right along, and it gets on plane in its own length. In addition, I am using about the same amount of fuel as the 13 Whaler with a tiller 25 horse evinrude that it replaced. I chose the Johnson based on price and previous exellent experience with OMC motors (there's that brand loyalty). I was looking for a used motor before that, so $4500 was a good deal. However, I would have chosen a yamaha if I had the money. From what I've heard, they beat everyone when it comes to reliability. I've still seen some new ones with problems, and know of one that is unusable (dies without warning) and the dealer won't cover on warranty, since they couldn't find the problem.
Anyhow, expect to do a lot of reading on this subject. Good luck.
lhg posted 04-25-2001 06:22 PM ET (US)     Profile for lhg    
There may not be as much discussion on this as one would think, since the subject has been well discussed before. Look through the the last year's forum posts.

By mentioning 115's, I'm suspecting speed or high power may be an issue for you. If so, stay within the HP ratings, and get a Merc 90, which will be about 4 mph faster than either an OMC or Yamaha 90. I'm also assuming you're talking carbureted 2 strokes here.

If Merc is out of the question, or slower speed and higher price are not your issue, get a Yamaha. Main reason in recommending this is, like Mercury, the oil injection system is self contained on the engine. No extra tanks to fool around with on the Montauk, which, like the 13's and 15's, does not have a good place for one.

Other reason for recommending Yamaha or Merc (or other brands) is that OMC ceases to exist, and nobody seems to know what's going on yet. You may not even be able to find a leftover 2001 Johnson 2 stroke. The Dealers are hurting, angry, frustrated, upset, etc. I'd stay away from that situation until you can buy a Bombardier Johnson 2 stroke, from one of THEIR re-appointed Dealers. My guess is that the conventional Johnson 2 strokes may be out of production for good, but nobody seems to know for sure. They may try to unload existing inventory before they announce what's happening, or not going to happen.

All of the plant employees that made these engines are drifting aimlessly, finding new jobs and having never been contacted about going back to work. That does not indicate much of anything is going to be built in the old OMC plants, at least not Waukegan IL. Only some engineers, sales and clerical people have been hired, mostly to get some parts moving again and to bail out the Ficht problems. Time will tell, but in the meantime Mercury and Yamaha are fast grabbing up the old OMC market share. At least 1/3 to 1/2 of it has already been lost.

marc monreal posted 04-25-2001 07:21 PM ET (US)     Profile for marc monreal  Send Email to marc monreal     
Thanks for the info regarding yamaha and mercury outboards. I see primarily 90 hp engines on the whalers in my area, " southern california." Still I was wondering how a 70 hp yamaha would work out since I've come across one for a relatively good price, $2000.00. The engine comes with three gauges, two props, control box, cables and two fuel tanks and only has 100 hours on it. The engine looks virtually new although it is a 1990. Any thoughts would be appreciated.
Thanks, Marc
lhg posted 04-25-2001 07:37 PM ET (US)     Profile for lhg    
Marc - there are many here, with considerable experience in Montauks, who think 70 HP is close to the ideal engine for the boat. Dig around in the previous discussions. Yamaha 70 is nice engine from what I've seen.
Mark D posted 04-25-2001 09:42 PM ET (US)     Profile for Mark D    
I have looked into this myself being I have an aging 70 HP E'rude. For the money a Tohatsu can't be beat. A local dealer told me out of all the outboards he sells; Johnson, Evinrude Merc ect He said he never in 18 years had a Tohatsu returned on a warranty claim.
They make a 3 cylinder 70 or 90 HP
compounder posted 04-26-2001 10:39 PM ET (US)     Profile for compounder  Send Email to compounder     
Eric, are you sure about that "gets on plane in it's own length"? My Montauk is powered by a new 90hp Yamaha and I don't think it even comes close to getting on plane in 16'7", even with the 15" pitch prop I recently borrowed.
rwest posted 04-27-2001 06:20 AM ET (US)     Profile for rwest  Send Email to rwest     
If power and speed are your thing, the the Merc 90 would be a good unit to put on the 17 Montauk. If you don't need to go 5o MPH and money is a factor, try smaller. I just rehabed a 30 year old 16 bare hull into a Nauset with mahogany interior and due to cost went with a 50 2 stroke Merc. I plane at just above 10 MPH and she tops out in low 30's. The cost of the 50Merc vs. a 60 Merc was nearly $1000 less and it beat the price of a 60 2 stroke Yamaha by over $1500. To me the ideal engine would be in the 60-70 range but price was a big factor after doing the rehab. When I was younger kids around here (Eastern Shore of VA) got 13's and dropped 50 Mercs ont them and later a ton of 16's came around with 115's to 140's on them. Freeboard was reduced to less than 6 inches and several were flipped end for end when they began pushing 50 MPH and went airborne when air passed under the hull.


marc monreal posted 04-27-2001 07:23 PM ET (US)     Profile for marc monreal  Send Email to marc monreal     
Thanks everyone for the info/opinions on the re-powering of my Montauk. I decided to purchase the 70 hp yamaha with a 100hrs on it. I was able to renegotiate the price and paid $1700.00 for the whole pkg. Hopefully I'll have the motor rigged and ready to go within a week. Does anyone have any thoughts on what may be the ideal size prop& pitch? I looked through past forum comments and was unable to find any info regarding this set-up that I have. Any and all comments would be appreciated.
Thanks, Marc
Eric posted 04-28-2001 05:02 PM ET (US)     Profile for Eric  Send Email to Eric     
Marc, that sounds like a great deal. I'm sure you'll be happy with it.
Compounder, I may have underestimated the hole shot of my boat, but it sure pops up on plane fast. My 1962 hull is the lightest 16 foot hull built, with less wood than later models. I've got a fiberglass console, cooler seat, tank, battery, oil tank and not much else, not even a lid on the console seat, or a grab rail. It's underpropped with a 14x17 prop, and the V4 has more torque off idle that the much smaller 3 cylinder motors. It'll pop up fast!
One additional question for you: what's the derivation of the tag "compounder". Are you an engineer or pharmacist? Is this the boat name you use on the VHF? I'm just south of you in Bradenton, so I'll listen for you when I get my new radio.
compounder posted 04-28-2001 05:54 PM ET (US)     Profile for compounder  Send Email to compounder     
Eric, I was a pharmacist in a previous life, specializing in compounding specialized dosage forms. I did a lot of work for vets, and was very successful with apes & birds especially.

Luckily, my profession allowed me to retire at 50. Now I spend lots of time on the water!

Use "WhalerOne" on the VHF.


Eric posted 04-28-2001 06:00 PM ET (US)     Profile for Eric  Send Email to Eric     
Compounder, I'm a veterinarian. Interesting coincidence! I use floating doc on the VHF, hope to hook up with you. Eric
compounder posted 04-28-2001 07:39 PM ET (US)     Profile for compounder  Send Email to compounder     
"floating doc" is neat! I like that one!

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