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Author Topic:   MONTAUK 17 90-HP Propeller Recommendation
billmontauk posted 04-02-2004 06:10 PM ET (US)   Profile for billmontauk  
[The author has a MONTAUK 17 just re-powered with a "new" 90-HP Yamaha 2-stroke engine and solicits recommendations of proper propellers in both aluminum and stainless steel.]
Peter posted 04-02-2004 06:26 PM ET (US)     Profile for Peter  Send Email to Peter     
I'd start testing props in the 13 x 17 size range and see where your WOT tachometer reads as you are normally loaded. I doubt that motor can turn any more than a 17 inch propeller on that boat.
bwmenemsha posted 04-02-2004 07:30 PM ET (US)     Profile for bwmenemsha    
Hi Bill. Glad to see that you found your way to Custom Marine and found yourself a good deal. Soon Professor Sal D. from Univ. Of Velocity will arrive on scene to take you right through it.
jimh posted 04-02-2004 08:36 PM ET (US)     Profile for jimh  Send Email to jimh     
Using a 90-HP engine on a Montauk is one of the most common set-ups. There has been extensive previous discussion of this.

No really serious attempt at propeller optimization can take place until you have both an accurate tachometer to measure engine crankshaft speed and an accurate GPS to measure boat speed.

If you have both of these and are interested in experimenting, please let us all know of your current set up and the boat speed as a function of engine speed.

Otherwise I recommend getting the stock Yamaha 19-inch propeller and call it a day.

Peter posted 04-02-2004 09:31 PM ET (US)     Profile for Peter  Send Email to Peter     
Jim, I'm a little confused about the stock Yamaha 19 inch propeller recommendation. Some good test data from the E-TEC/Montauk thread suggests a 17 inch pitch is probably right. Both the E-TEC and the Yamaha 90 run through a 2:1 gear ratio. Both have a WOT max RPM of 5500 and the E-TEC has more displacement. Thus, my suggestion to start with a propeller of the 13 x 17 size range.
jimh posted 04-02-2004 09:42 PM ET (US)     Profile for jimh  Send Email to jimh     
Peter--You are probably right. I was shooting from the hip and maybe I nicked my foot.
billmontauk posted 04-03-2004 07:40 AM ET (US)     Profile for billmontauk    
Thanks for your suggestions I guess I'll first run the 17 aluminum and get back to yhis forum with the rpm's and speed and boat reactions at different speeds. I wanted to optimize the prop selection for fishing and for skiing and tubing
Bigshot posted 04-05-2004 02:52 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I ran a 90 Yamaha on my Montauk and she ran PERFECT with a factory 17" stainless prop. With just me it would hit 5500 on the nose.....can't get any better than that. The Yamahas seem to like the OEM prop although Mercury and many aftermarkets will work. The 115 and 130hp will fit along with the 75 & 85hp models. They all use the same lower unit and prop. Look on E-Bay for a nice used one, should be about $150.

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