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On my 1993 Montauk 17, How many holes up should installer mount my new Yamaha F90 4 stroke?

Any help will be appreciated

Thanks Osprey 1

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Start with 2 holes up. Top bolt in the 3rd hole, counting down from the top.

Props tested and recommended by Montauk 17 owners with the F90 include:

13-1/3 x 18 Yamaha Performance Series
13 x 19 Yamaha Painted SS
*Size only applies to model listed above and is not transferrable.

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Phil, sorry - I’m still a little confused - right now the installer mounted it at 1 hole up and did a test run and said it ran fine. I told him I wanted it 2 holes up Based solely on this forum and he said he would Change it but Only one more time. I wanted to know what you and forum thoughts before I tell him to change it to 2 holes up.

Plus are these the prop for my F90on Montauk 17

Thanks for your input

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You want him to raise the engine higher by 1 hole from its present location.

"1 hole up" is a safe location for 90% of boats and is easier for installers to do. Don't need to factor anything just install any engine on any hull same way.

The difference is drag. At 1 hole up, there is more engine in the water that needs to be there, slowing you down. For each hole = 200 rpm's.

The props I listed are for your model and engine.

What prop are you buying? Skip the aluminum. They are cheap but don't perform as well and are not as durable to damage.

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Phil,

Thanks for dumbing it down so I could Understand - Yes - I plan to tell the installer to mount it 2 holes up. The prop they put on the motor is the AL Prop # 6E5-45945-01-EL cost was 165.00

However - I’m willing to get the better propellers for my set up since I paying all this money already. What do you think they run $

The performance series propellers 13 - 1/3 x 18.

Question

Is 13 the diameter
Not sure what 1/3 means
18 must be pitch

Thanks so much for your help - I want to make sure I get the right set up for my Montauk 17

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The propeller they installed in a Yamaha 13.5" diameter by 17" of pitch aluminum propeller. Typical dealer choice.

I learned myself, and read a great deal on props and repowers. I am prepping for a repower now, actually.

I see it as its like buying a Ferrari and then installing discount tires on steel rims. Sure, the car will go, turn and stop. Spending the money on a stainless steel prop will allow you better performance and is more durable if you accidentally hit something. The old tale about lower unit damage is no longer applicable.

After spending 9k for an engine, 1k on rigging, 1k on install/repairs and sales tax, for what actually propels the boat forward the dealer installed a $165 prop ($140 @ amazon).

I agree a repower is a blank ton of money and maybe it is too much too soon. When you are ready, maybe for Christmas, install a stainless prop. My personal preference is the painted stainless steel. Good performance, a little less expensive. Warning, they are expensive $500-700. Then again, so is an F90.

https://www.simyamaha.com/Yamaha_Prop...-03-00.htm

In the end it is your boat, your choice and this is just one opinion.

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A used 13x19 SS prop will easily be found on e-bay.

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Phil - Thank you for your expertise- I think I will get the painted propeller!

I do have a another question: Is buying an outboard like buying a car? I thought I was getting a new 2020 Yamaha F90 but I look on the outboard nameplate and it said “built 10/17”. So it looks like I am getting a 3 year old but new Yamaha F90

Is this normal - I feel like I’m not getting the latest 2020 outboard

Thanks

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No, not normal.

You are buying NOS. New, old stock.

I would expect a serious discount (20%) for a motor that old.

I would put the brakes on the deal and take a second and re-assess.

Sent you an email but it bounced. Check your email address in your profile.

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I know they went to something like that about 10 years ago where they were no longer selling current year motors, if it was current model, it was good enough. I do not remember the details but many were not happy then. I forgot about that until now.

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I recently powered my 1988 17' Montauk with a 2020 Yamaha F90. Running a Powertech 3 bladed SS 17P. Engine mounted 2nd hole from top. Runs like a scalded dog, fast hole-shot, planes about 12 kts, and tops out 39 kts with me and full fuel. I'm very happy with the combination but will admit, I did not try the next hole up however, I'm reaching 6000 RPM.

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Reel -

Which PowerTech 17" prop? Is it a SCD?

Are you 1 hole up?

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Yes and Yes.

SCD3R17PVM90 Powertech