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Prop for 90 hp Yamaha 2 stroke
seanwilmnc	#1  Posted on 07/15/12 - 4:12 PM
Member Personal Page Posts: 74 Comments: 0 Joined: 06/30/12	Any idea why this prop has sharp corners vers a typical prop? http://www.flickr.com/photos/45988259...578453486/
Tom W Clark	#2  Posted on 07/15/12 - 4:31 PM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	That's an old Yamaha semi-clesvr design that has been modified or simply gropund down. Here is what a new verison looks like: http://www.yamaha-motor.com/outboard/...etail.aspx
Joe Kriz	#3  Posted on 07/15/12 - 4:34 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	Looks like something you would use to grind up sausage or hamburger.
seanwilmnc	#4  Posted on 07/15/12 - 5:23 PM
Member Personal Page Posts: 74 Comments: 0 Joined: 06/30/12	Yea it is scary looking for sure. I am wondering if switching the prop to something different would be beneficial. I use my boat (17" 1985 Montauk) just in the waterways here on the East coast. I really dont go into the ocean. I want a good prop that works well with my motor. What would you all suggest?
Tom W Clark	#5  Posted on 07/15/12 - 5:28 PM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	There is no question but that a new prop would be profoundly beneficial. Because we have propped so many Montauks with the two stroke Yamaha 90, I do not think we need to discuss it much. You'll make good use of a 13-1/4" x 15" Stiletto Advantage 4.25 with a DE-500 hub kit. There is no better prop for the money. You'll make even better use of that prop if the motor is raised up on the transom.
seanwilmnc	#6  Posted on 07/15/12 - 6:46 PM
Member Personal Page Posts: 74 Comments: 0 Joined: 06/30/12	How and what do you think I will notice the difference with the new prop? Where is the best place to get the one you suggest? Thanks
Tom W Clark	#7  Posted on 07/15/12 - 6:56 PM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	Well, if you use the recommended prop and raise the motor I think you will gain some top speed, improve your rate of acceleration, reduce the amount of bow rise during acceleration, reduce your steering effort and get better fuel mileage. Some folks who have made this change report their boat feels like a completely different boat. But other than that, not much. Spend some time using your new boat with the prop it has. Get to know the boat and also get some GPS speed numbers...then make the change and see how it does. You can buy the Stiletto Advantage any number of places. Google it and see what comes up. I hear Dan's Discount Props is good.
Joe Kriz	#8  Posted on 07/15/12 - 7:00 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	See this article and let us know what bolt holes your engine bracket is mounted. http://www.whalercentral.com/articles...cle_id=106
seanwilmnc	#9  Posted on 07/15/12 - 7:10 PM
Member Personal Page Posts: 74 Comments: 0 Joined: 06/30/12	Looks like it is all the way down. http://www.flickr.com/photos/45988259...579526340/
Joe Kriz	#10  Posted on 07/15/12 - 7:13 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	Yes..... and that is part of the problem and you are not getting the best performance and economy from your motor because of too much drag.
seanwilmnc	#11  Posted on 07/15/12 - 7:26 PM
Member Personal Page Posts: 74 Comments: 0 Joined: 06/30/12	what bolt holes should I raise it to?
Joe Kriz	#12  Posted on 07/15/12 - 7:45 PM
Site Owner Personal Page Personal Album Photo Albums Project Albums Posts: 11447 Comments: 452 Joined: 03/18/05	For the Yamaha, probably 2 holes up... For the newer E-Tec, most have reported all the way up.... See this article for drilling holes if necessary for your 1985 Montauk 17' hull... http://www.whalercentral.com/articles...icle_id=82
Tom W Clark	#13  Posted on 07/16/12 - 7:06 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	Two holes up at the very least and three holes up if the Stiletto Advantage is used. You'll need to fill those two pesky "blind holes" and drill two new holes on the BIA standard spacing but 6-1/2" below the top holes instead of 8" below the top holes.
seanwilmnc	#14  Posted on 07/16/12 - 9:35 AM
Member Personal Page Posts: 74 Comments: 0 Joined: 06/30/12	Thank you for all the great information. I am on the hunt for the new prop now.