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Hi all! I have a 2000 Montauk that I am contemplating rigging a Yamaha f70 0r a new Honda 100. I am leaning toward the F70. My main concern is having enough power for 4 people and a full tank of fuel for crushing and fishing. Any one have any time with the F70?

Thank you!!!!

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Good morning,

I repowered my 1988 Montauk 17 with the Yamaha F70 last month and have had it back in the water for 3 hours running time. I am certainly pleased with the power and speed so far. I am just now able to give it full throttle for brief periods and it's as fast as I want to go in a classic Montauk. My usual load is two adults, fuel, and a large wet dog. If you want more details on the prop and mounting position I will certainly share that with you. The driver for my decision to go with the Yamaha was the number of local dealers for the motor. There are not many Evinrude dealers in this area.

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I have an F70 on my 15 and love it, but if top performance with 4 people on board your Montauk is the primary goal, I would be thinking about the Honda. To some degree, it also depends on how fast you want to go, and of course how much the people weigh!

I am a firm believer in putting max horses on boats - this gives you more flexibility for times when you are heavily loaded, or for rough conditions or when you need to outrun a storm. The BF100 looks like a great motor - everyone seems to love their Hondas; the only downside seems to be that they aren't cheap! With modern fuel-injected motors, you don't pay a mileage penalty with a larger motor (within reason).

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I too think the Honda 100 is a great engine. It does weigh 100 pounds more than the Yamaha F70, (360 versus 257 lbs.) Looking at the F70 on my boat I am not sure I would want another 100 pounds on the transom. My battery is presently at the stern. If it were in the console that might give the Montauk better balance with the Honda.

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Given the block/displacement/weight is the same for the BF75-100, I would be interested in the price difference between the 90 and 100 in terms of $ per hp. The extra 10 hp should not be at a premium.

Rigged and propped right, the F70 WOT ~32-33 mph at full load. The BF 100 would attain WOT ~ 42-43 mph.

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Hello Spliterspatter,
I repowered my 15 foot 1995 Dauntless with a F70 this season. I couldn't be happier with the performance for the size boat I have and picked the F70 because it was only 7 pounds or so heavier than the old 70 HP Evinrude which it replaced. I usually only cruise with me, (270 lbs) and my wife, (140 lbs). When we add another couple of similar total weight, the performance is just adequate and not really good for all day cruising. I believe on your 17 you would want to stick with as close to the original max H.P rating for the boat which is 100-120 H.P. In that class I believe the Mercury 115 which is listed as the same weight as the Honda 100 wouldt be the lightest max H.P choice. You could also look at the 90 HP ETEC which while the same weight as the Honda 100 or Merc 115 will give you the hole shot and planing performance of a 2 stroke.

Jim G.

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I have had a Yamaha F70 on my 1999 Alert 17 for 3 years now and I can tell you it is a great motor for a 17 ft Whale, great fuel economy,pushes my boat with 2 adults and our fishing gear 36.4 mph and I can coax anther 1 to 1.5 mph out of it with just me ( 160 ) and very lightly loaded. I run a Yamaha Performance Series stainless steel 13.25 x 14 prop mounted all the way up. That said if you want to haul 4 people you may want more power. IMO the Honda is too heavy for a 17 Montauk and will affect boat handling in an adverse way. If I needed more power than 70 hp my choice would be the 320 lb Etec90. I used to have 386 lbs of motors on the back of my boat ( main motor and kicker ) and my boat handled like a tank and also took an occasional wave over the transom, after repowering with the F70 and a 6 hp Tohatsu kicker for a total of 319 lbs I noticed a huge difference , the boat handled like a sports car, the ride was softer, and no more waves over the transom. Sometimes I take my kicker motor off and just run the F70 and it handles even better. I have found out 320 lbs is fine, thus if I needed 90 hp I would go with the Etec 90. I know some will say the 360 lb Honda is fine and maybe it is for them, but this is what I have found out from personal experience. I use my boat only on Lake Erie so I am talking about all kinds of sea conditions. Just my 2 cents. Hope this helps.

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Splittersplatter I was wondering what you decided? I'm at the same point of re-powering my 1989 Montauk with a Yamaha F70 or F90. I have found a really good deal on a 2016 F70, but am concerned about under-powering the boat.

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Yamaha re-designed their 75 and 90 and dropped a little weight. Might be worth a look.

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Thanks Blaster, I'll have to do a little more research.

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Yamaha 75/90 HP = 366 pounds

Yamaha 70 HP = 257

Direct from Yamaha's website for the 20 inch Long Shaft version:
http://yamahaoutboards.com/outboards/...ifications

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http://2017newproducts.yamahaoutboard...boards.com

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All new E-Tec motors, installed at the dealer, come with a 10 YEAR WARRANTY...!!! I decided today to put a new 115 HP E-Tec on the new to me, 1991 OUTRAGE 17 - I. No break in period, no service for the first 3 years (300 hours), and they sip oil... 3 gallons of oil on Amazon, is $98 delivered...

Moderator Note: The model year you listed in separate thread is 2014. The max hp rating for the Montauk is 100hp.

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The Yamaha is a great choice. I think all 90 4S motors are too heavy unless you have an Alert 17 or Outrage hull. You will not feel comfortable with the trim after adding a heavy weight engine on the transom. If you want extra power your only option in my opinion is the E Tec 90. We have mounted three F70 Yamaha motors on 17' hulls. They are reliable, quick starting, very responsive and fuel efficient. Four adults and gear work well. We tube with three adults and two kids and, it works great. I have tested and have the necessary information for mounting and, exact prop sizing for maximum performance for the F70. Best of luck.

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I am aware of that fact. My point was the 10 year warranty by Evinrude...

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EddieM- I would be interested in your information. I recently purchased a 2002 Montauk 17 (classic hull) which has a 2013 Yamaha f70. I do not know what propeller is on the motor, and I do not know how many holes up it is mounted. The boat is not currently at my home. I do know when I purchased the boat, top end was only 29 mph according to the garmin gps. Two men on board, half tank of fuel (maybe 425 pounds), calm conditions, little to no wind. I feel this hull and engine is capable of better performance. Please share what information you can to advise me.
Thanks, Tom

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Yamaha F70 on a 2002 Montauk 17 needs a Yamaha Performance Series stainless steel 3 blade 13.25 x 14 propeller and the motor needs to be mounted 3 holes up. 3 holes up is as high as you can go. This is the perfect set-up for this combination. This information was given to me by Tom W Clark and this is how my boat is set-up. With 2 people you will get around 36 mph and alone with a light load and trimmed just right you should get close to 38mph.

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Thanks, Alan. I will compare my set-up to your recommendation when I get my boat out of storage.

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tsa, three holes up is where I mount my F70 motors and Alan has listed the size propeller information which used to be the only size Yamaha made for this combination. I used that on a Standard 17' and it reached 6300. Our Montauk would only hit 6000 to 6100 depending on wind and tide. Yamaha makes a new clunk-less prop for the F70. It is stamped 14-K X 13 1/8 (PN 6N7-45970-00). It is also a performance series (Talon SS) polished prop and hits the maximum RPM mark for the motor which is 6300. 29mph for a F70 on a Montauk can be corrected easily. As you can see Splittersplatter, its an easy set up and, there are members here that have the same information for many other Montauk/motor combinations. Good luck.

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Per this link below, I think the new 2017 Yamaha F90 weighs in at 353lbs - because it says the new model is 13lbs lighter than the previous model (which was 366lbs)

http://2017newproducts.yamahaoutboards.com/

From my experience, I would also agree with others from this post - the F70 is a great match for the Montauk hull. The power / weight ratio is a nice balance, it sips fuel, it's very quiet, reliable and very quick & responsive.

.

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Apparently this motor is not available yet. Otherwise it would be listed on their website with the other available motors and not listed under new.

Anyone have one of these?

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My boat yard that sells Yamaha, recently sold a new F25. So that motor is out and not sure if the 90 would have a different timeframe

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With a new model releasing soon, it may be advantageous to find a dealer who has an "old design" motor and negotiate.

It is getting harder to do with the reduction of floor financing.

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I seldom have 4 adults on board, but I couldn't be happier with the F70. That extra 100 lbs is almost like having a fifth person on board, and that's got to mitigate whatever advantages you get from a larger hp..

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Would you get similar performance from the F70 on a 1999 Dauntlas 16?