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Author Topic:   90 or 115 for 17 foot Montauk
JimU posted 07-18-2000 12:39 PM ET (US)   Profile for JimU   Send Email to JimU  
Does any one have any experience or recommendations concerning the relative merits of a 90 HP three cylinder vs a 115 HP V-4 Yamaha engine for a 17 foot Montauk. The boat is an older boat (1971 model) that I acquired without engine for our state wildlife and fisheries department which actually had it powered with a 115 Yamaha. I am aware that the boat is rated to 100 hp. I can get a "real deal" on the 115 and only a "fair deal" on the 90. Some have said the boat will actually perform better with the 90 but I favor the 115 for skiing because it has "more power". Thanks for any input. JIM
Bruce Boehle posted 07-18-2000 02:38 PM ET (US)     Profile for Bruce Boehle  Send Email to Bruce Boehle     
I have a 90 Yam on mine and it is fine for one skier but if you plan on puling two up the 115 would probably be better.


kingfish posted 07-18-2000 03:05 PM ET (US)     Profile for kingfish  Send Email to kingfish     
Had a 100 hp Merc on one of my Montauks (90 Evinrude on the other) and the 100 did go like a raped ape. If memory serves, the Montauk with the 100 was about an '84, and was rated for a max. of 110 hp; that would have been, I believe, when hp was rated at the power head, not at the prop as they are now. Moral of the story is this: You should only exceed the Mfr. recommended hp rating *at your own risk* and with an older boat and a newer motor, you could be exceeding the Mfr. rating further than you think.
Rsess posted 07-19-2000 10:20 PM ET (US)     Profile for Rsess    
I have a 1971 Nauset we owned since new. First motor was a 1971 100 Johnson. Replaced in 1986 with 115 Yamaha. Speed went from 36 mph to 45 mph. Boat is perfectly balanced. Runs terrific. Great for skiing. We must have 350 hours on the engine. The weight is no problem. Do not hesitate to get 115 hp. unless insurance says not to. My boat does not have any tag on hull with max hp, although original brochure always said 100 max. good luck
JimU posted 07-20-2000 11:57 AM ET (US)     Profile for JimU  Send Email to JimU     
Thanks for the info. Does anyone else have any suggestions? Thanks JIM
djmerrill posted 07-20-2000 10:04 PM ET (US)     Profile for djmerrill  Send Email to djmerrill     
I have driven many Montauks, and 90HP seems to provide plenty of power for skiing, 42-47 mph depending on setup. Note that even brand new 90HP motors will vary widely-the OMCs are V4s and weigh 340lbs, the Yamahas are 3cylinders and weigh 250. The OMC will provide more torque, but weighs more-no right answer. I don't know about mercs... Many say the boat is ideally balanced with 70 HP, but the 90 will provide more Ummph for skiing.

On exceeding the manufacturer's specs, do it on careful consideration of your needs. I have seen several Montauks with 115s mounted on them. Since their weight is no greater than the OMC 90's, the Montauk handles the weight fine. It will push the boat faster, but over 45 the Montauk is VERY sensitive to trim, and chine walk and porpoising can become an issue. The Montauk was not designed as a 65mph bass boat. If you are not experienced, or you intend to let kids or friends drive the boat, it can be much more of a handful and potentially dangerous with higher HP engines. Some have suggested getting lower HP stickers for engine cowlings-dont kid yourself, if an accident occurrs you will be financially liable and if someone is hurt very guilt ridden. I don't think putting a higher HP engine than recommended is actually illegal (will the coast guard or marine police cite you?), but you are certainly sticking your neck out by using the boat in a higher performance application than BW designed it for. That being said, BW is (was?) a VERY conservative company, this results in the overdesigned hulls that we all love!

drewhess posted 07-20-2000 10:05 PM ET (US)     Profile for drewhess  Send Email to drewhess     
I own a 71 Nauset and just bought a new 90 Yamaha. I bought it because of the horse power limitation and the fact that it is significantly lighter than a 115. I couldn't really justify the cost (purchase and gas consumption) and the weight of a 115.

100lbs on the back end does make a difference on a smaller boat.

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