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Speed - Nauset 16 with Yamaha F70
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| WRufus |
Posted on 01/15/13 - 12:00 PM
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I am new to Whaler Central and am in the process of a Nauset 16 restoration. I have my eye on the Yamaha F70 for many reasons including it being light / quiet / efficient / new technology, etc. I know the prop makes a difference -but if it is set up right. What kind of speed & performance are folks getting with the pre-smirk 16/17 hulls? Mine would have a center console and would not have tons of gear or fuel or people or water skiing, etc. I believe I have seen folks are getting around 37/38mph? Any help or suggestions are greatly appreciated.
Thanks,
Scott
1989 Montauk 17' w/ F70 Yamaha |
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| Phil T |
Posted on 01/15/13 - 12:45 PM
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If mounted correctly, 2 holes up, with the appropriate prop, 36-38 mph at WOT should be attained.
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| Tom W Clark |
Posted on 01/15/13 - 1:02 PM
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Mount the motor Three Holes Up if using a Stiletto, Turbo or Yamaha Performance Series 3-Blade propeller. The ideal size 13-1/4" x 14" and you should see a top speed of 38 MPH.
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| WRufus |
Posted on 01/16/13 - 11:32 AM
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Thanks I really appreciate the info. 37-38mph top speed is was what I have read for the yamaha F70 so good to hear you guys have the same info. The other option is a 90 etec but that is about 65lbs heavier and again I would really like a 4 stroke for it being quiet and not to have to burn oil, etc. Sounds like this hull will get to the 42-44mph range with a 90 etec. So is it true with the 16ft hull going from a F70 to a 90etec (increase by 20hp and 65lbs of weight) you pick up about 5-6MPH in top end speed?
1989 Montauk 17' w/ F70 Yamaha |
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| Joe Kriz |
Posted on 01/16/13 - 11:40 AM
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WRufus wrote:
I would really like a 4 stroke for it being quiet and not to have to burn oil, etc.
You are thinking about old 2 stroke technology.
The new 2 strokes are just as quiet, fuel efficient as a 4 stroke and generally weigh less.
The Yamaha 70hp is hard to beat for the weight of 257 pounds.
If you want to go with a 90hp, here are your other current choices with the weights listed.
http://www.whalercentral.com/articles...ticle_id=5
Edited by Joe Kriz on 01/16/13 - 11:46 AM |
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| WRufus |
Posted on 02/20/13 - 6:31 PM
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Is there anyone else out there with an F70 that can share their experience? Maybe I'm wrong but I imagine the F70 is indeed quieter than the equivalent fuel injected 2 stroke. I know 4 stroke Yamahas very well and have been on plenty of boats with fuel injected 2 strokes and don't get me wrong I like them both, I am just not familiar with the F70 on this hull. I was thinking of running with only two 6 gallon tanks. They are more portable and everyone I have spoken with says the engine sips fuel, which is nice.
Edited by Tom W Clark on 02/21/13 - 10:22 AM
1989 Montauk 17' w/ F70 Yamaha |
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| mtown |
Posted on 02/20/13 - 6:56 PM
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I have 2 of the 16 foot with same hull as the Nauset. One has a 2-stroke 90 hp Yamaha, the other a 70 hp two-stroke yamaha. The 70 is almost new as it was a leftover and I bought two years ago "new". It is very quiet and pushes the boat at good speed with 18 gallons of fuel and four people. It does use more fuel than a four stroke. The boat with the 90 hp is very fast. I have only run it by myself, so I cannot give feedback about the performance with a load, but it almost seems like more than you need unless you are really into speed. I allow my kids to take friends out on the one with the 70 hp but I would be nervous letting them on the 90 hp.
Even though I am not in the market to re-power either boat, the F70 sure seems like a great fit { the 4-strokes were a little heavy for my liking when I pulled the trigger} Having read about the E-techs, I would think the 90 hp would be way more than needed.
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| DennisVollrath |
Posted on 02/20/13 - 7:14 PM
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Hi Scott,
I have a Yamaha F70 mounted on my 1988 Montauk 17, and am quite happy with it. The motor is mounted 3 holes up, and I am running a Stiletto 13.25" x 13" prop. It seems to be a bit under-propped, as I can pretty easily get the motor to rev-limit. The boat can reach 36MPH with me (220#, but I'm working on it) and 23gal of fuel. Best planing milage is 7.5-8 MPG cruising at 21MPH, around 4000RPM. Between the lightness of the Yamaha and moving the battery to the console, the boat now rides 2-3" higher in the stern that it did previously.
Hope this helps.
Dennis
1985 Outrage 18 with Suzuki DF140A |
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| Tom W Clark |
Posted on 02/21/13 - 10:21 AM
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The ideal prop would probably be the 13-1/4" x 14" Yamaha Performance Series 3-Blade. I've been trying to find one for Dennis to test.
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| tedious |
Posted on 02/21/13 - 1:50 PM
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WRufus wrote:
Is there anyone else out there with an F70 that can share their experience? Maybe I'm wrong but I imagine the F70 is indeed quieter than the equivalent fuel injected 2 stroke. I know 4 stroke Yamahas very well and have been on plenty of boats with fuel injected 2 strokes and don't get me wrong I like them both, I am just not familiar with the F70 on this hull. I was thinking of running with only two 6 gallon tanks. They are more portable and everyone I have spoken with says the engine sips fuel, which is nice.
I have an F70 on my 15, and I get 9 - 10 mpg at cruise of around 4000 RPM. I'd imagine you'd get a bit less, but not much less.
I don't have an eTec, but having heard them on other boats I don't think they're a lot noisier than a 4-stroke, if at all. Don't confuse eTecs with transitional technology FI 2-strokes such as the Optimax or Yamaha HPDI - they're different, and much noisier, beasts. It there was an eTec 70 I probably would have bought it, although I do like my F70.
Most people ask: 2-stroke or 4-stroke?
They should ask: Today's technology, or noisy, smelly yesterday's?
Tim
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| Aquanutt |
Posted on 02/22/13 - 6:09 PM
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Hey y'all, I installed a Yamaha F-70 on my 1970 Nauset this past fall. I couldn't be happier. I mounted it 2 holes up on the transom. My top speed is 38 mpg with a stock Yamaha stainless steel 17" pitch prop that will turn the engine 6000 rpm trimmed up. Most of my running is in the 4000 rpm range that gives me a mid 20's cruise. The weight is correct for the older hulls. No smoke, it's quiet and has plenty of power. I haven't water skied yet with it, that will come when the water warms up.
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| Tom W Clark |
Posted on 02/23/13 - 7:31 AM
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There is no such thing as a "stock Yamaha stainless steel 17 pitch prop". The F70 comes out of the crate without a propeller and one must be selected for it by the dealer or owner.
Yamaha makes several different models of stainless steel propeller to fit the F70. Which one do you have?
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| Aquanutt |
Posted on 02/24/13 - 3:06 PM
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I have the painted stainless steel propeller part number 688-45930-02-98. The reason I called it "stock" was that it's not the 4 bladed, polished etc...
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| Tom W Clark |
Posted on 02/24/13 - 3:27 PM
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Whether it is painted, or has four blades, has nothing to do with being "stock".
The Painted Stainless Steel model form Yamaha is a good propeller model. It is the ONLY model of stainless steel propeller Yamaha offers that is not made in the USA by the PPI Inc. division of Yamaha.
The Painted Stainless Steel model also has a unique semi-cleaver blade design with modest rake. It is good for stern lift and faster than most people think.
For the F70 and all the other intermediate size gearcase motors, there are five different models of propellers to choose from branded as Yamaha.
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| WRufus |
Posted on 05/02/13 - 7:07 AM
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I ended up picking up a used yamaha F70 with 134hrs that was very well cared for by someone I know well (who is also a yamaha master mechanic). I really feel lucky to have found it. The F70 is now going on the 1989 montauk...so my plan changled slightly. The motor didnt come with controls or a prop, so I have to order everything and rig it all up. I will also be moving the batt to the console all at the same time. All that said, I have a bunch of questions and would really appreciate your thoughts/suggestions/insights. All the help you have given me thus far has been great - so Thank you.
- how long should the control cables be? I would like them to be the right length w/o extra. from the research I have done, I am reading 15 or 16' feet. do yamaha cables only come in 5' lengths? if so is 15' enough? there was a thread here (that I can't find) that showed pics of Toby Port's (fellow whaler central member) montauk with and F70 and the rigging looked super clean with the right length of control cables. I would like mine to look similar.
- prop it seems like the size is 13 1/4 X 13. I would like a aluminum prop vs. stainless (personal choice for a few reasons) any recommendations? for some reason I can find stain less props but having trouble finding an aluminum 3 blade prop that size. Is anyone familiar with the Solas Amita 4, 4-Blade Aluminum Prop, Fits Yamaha/Tohatsu/Nissan 60-140 HP, 13.25 x 13-P RH #3413-133-13? Any advantages / disadvantages to a 4 blade?
Here is the other rigging im picking up (hopefully I am not missing anything)
6YR-W0035-E3-00 TACHOMETER RIG KIT 2
Yamaha Optional Primary Engine Harness 10-Pin 5m (16 ft.)
704-48205-P1-00 CONTROL, BIN PRM SGL
Yamaha Single Main Switch & Stop Switch on Panel (Horn)
MAR-Cable-Sc control cable (size ?)
alumn prop 13 1/4 X 13 (kind ?)
Again I really appreciate your thoughts/suggestions/insights.
best
Rufus
Edited by WRufus on 05/02/13 - 7:11 AM
1989 Montauk 17' w/ F70 Yamaha |
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| DennisVollrath |
Posted on 05/02/13 - 7:45 AM
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Hi Rufus,
I have this same motor on my 1988 Montauk. I installed the Teleflex extreme CCX63320 cables. These are 20' long. I added the loop as they exit the motor (per the rigging length information on this site) to minimize friction and wear. I think it looks pretty clean. The loops stay above the splashwell.
I have a Stiletto 13.25 X 13" SS prop, and the motor is mounted as high as it can be (3 holes up). It may be a bit under propped, but the 15" was too long.
I have moved the battery into console as well. It is connected directly to the starter with around 17' of 6ga cable, a single piece. It works very well, starting the motor with no hesitation.
I'll take some photos Saturday, and maybe even try to put up a personal page.
Dennis
1985 Outrage 18 with Suzuki DF140A |
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| Tom W Clark |
Posted on 05/02/13 - 7:49 AM
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The 13-1/4" x 14" Yamaha Performance Series 3-Blade is probably the best choice of the Yamaha propeller options. Unfortunately, the 14" pitch is not offered in the Stiletto (Advantage) or Turbo (Turbo 1) versions.
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| WRufus |
Posted on 05/02/13 - 9:26 AM
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Thanks, that is helpful
sry that was a type-o on my part I meant to say 13-1/4" x 14" prop.. for some reason I am having trouble finding this size in an alumn prop?
it seems like I am hearing everything from 15' - 20' for the cables? I would like the not have extra, but have it set up correctly
should it be mounted 2 or 3 holes up? in my searches I have found people mounting an F70 both ways on a Montauk
thanks again
1989 Montauk 17' w/ F70 Yamaha |
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| Tom W Clark |
Posted on 05/02/13 - 9:35 AM
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Propellers are not generic pieces of hardware simply described by diameter and pitch. Size recommendations are specific to the model of propeller being discussed.
If you use an aluminum prop you'll probably want a 15" pitch.
If you use an aluminum propeller, you will not be able to mount the motor as high.
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| Tom W Clark |
Posted on 05/02/13 - 10:06 AM
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These are all the Yamaha branded propeller options for the F70:
http://www.yamaha-motor.com/outboard/...0~F115.pdf
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