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  115 Yamaha on '82 Montauk?

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Author Topic:   115 Yamaha on '82 Montauk?
lyndenboy posted 04-12-2004 08:42 PM ET (US)   Profile for lyndenboy   Send Email to lyndenboy  
I am considering putting a 1993 115 Yamaha on my '82 Montauk. Is there anyone out there who has run this combo, and if so, what was your experience?

I would certainly also welcome the experience of the masses on the combo. I am a bit concerned about exceeding the maximum hp and the weight. I need a motor, but wonder if I should wait to find a lightly used 90 instead of this 115. Are there other trade-offs I should be considering?

ALAFIARAT posted 04-13-2004 04:54 PM ET (US)     Profile for ALAFIARAT  Send Email to ALAFIARAT     
lyndenboy I ran a 87 115 Yamaha on my 1977 Newport (same hull) for ten years . I put a 28 gal. fuel tank under the console that helped out with the static trim . I came across the deal of a 3 year old motor for 800 dollars with a jack plate (divorce sale) or I would not have tried that large of an engine . After saying all of that I loved the motor.The only problem I had was letting some one else use the boat, it just went to fast for what the 17 ft . hull was designed to go. It would go at wot about 54 on a gps. The transome held up very well and i had ten great years untill i hit a submereged object and knock off the lower unit . I was always upthigt about loaning out the boat to my friends or my 20year old son . I now have a 100 hp Yami 4 stroke that I like very much (I dont care that Lgh thinks I got screwed) but im still nervous about loaning out the Whaler. Thanks Dave
Jim Bennett posted 04-13-2004 05:14 PM ET (US)     Profile for Jim Bennett  Send Email to Jim Bennett     
I have a 1968 Sakonnet (16'7" hull)with a 1979 Merc 115. (It originally had a 1968 Merc 100 when I bought it in 1972.) It will hit 45+ with the 115 Merc without trimming - I have no power tilt/trim. Figure it might hit around 50 if I could trim it. With a newer model 115 of any brand you should easily make that speed. Don't mean to imply that high speed should be the objective, just that your Montauk should be able to handle a 115. I think motor weight should be a major concern but believe a 93 Yamaha 115 should be lighter weight than my 79 Merc 115.
LHG posted 04-13-2004 07:24 PM ET (US)     Profile for LHG    
Jim, it's not. The Yamaha V-4 is about 60 lbs heavier at 358#, about same as Suzuki 70. Since many are happy with the Suzuki on this hull, the Yamaha should not be a problem.

The Merc in-line six 115 weighs about 300#.

frank_king posted 04-14-2004 04:52 PM ET (US)     Profile for frank_king  Send Email to frank_king     
i have a 97 model 115 johnson on my 82 montauk......l love it
Gene in NC posted 04-14-2004 05:42 PM ET (US)     Profile for Gene in NC  Send Email to Gene in NC     
You all are getting me in trouble.

1) Repairing my "looks like new" '84 Johnson 115 with a bad cylinder (ring I suspect) and,

2) Installing it on my '66 Sakonnet.

Not too much for top speed but do love hole shots.

OMC two stroke 115 and 90 weight should be same.

115 is a "vro" rebuild that failed soon after. Suspect a snagged ring. Considering a pull down and chamfer of all ports before another snag. What do you think?

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