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Mounting Yamaha 70-Or Trying To
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| Joe Kriz |
Posted on 02/25/11 - 3:28 PM
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So, did you drill the GREEN holes in this diagram?
http://www.whalercentral.com/articles...icle_id=82
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| wpruitt |
Posted on 02/26/11 - 4:33 AM
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Yellow because I wanted to have the ability to drop a hole if necessary. The whaler article about cutting or bending the washers is correct.
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| Joe Kriz |
Posted on 02/26/11 - 10:56 AM
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There are all types of washers.
My prior Montauk had square washers on the bottom holes as does my Outrage 18' as opposed to round washers.
Glad it worked out.
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| wpruitt |
Posted on 02/27/11 - 3:37 AM
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Mine had square on the bottom as well. The hole is too close to the curve of the splashwell and the bolt head is hitting the curve of the well. I am modding a piece of starboard to use as a base for the washer.
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| surfncnow |
Posted on 02/27/11 - 8:21 AM
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wpruitt wrote:
Mine had square on the bottom as well. The hole is too close to the curve of the splashwell and the bolt head is hitting the curve of the well. I am modding a piece of starboard to use as a base for the washer.
Check out my personal page. My motor is only mounted with the top holes 2 holes up. I did this to get an idea on where to mark the lower holes. Like you, it's gonna be real close drilling the lower holes. Before the motor was temporary mounted. I filled in the lower holes and re-gel coated the lower holes.
This is a real PIA. What prop are you gonna try? I just purchased a Yamaha Performance Series 13 1/4 X 16 stainless steel prop.
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| BobL |
Posted on 02/27/11 - 11:32 AM
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surfncnow and wpruitt,
Can both of you post some close-up pictures of your engine installation? It will help all of us that will be re-powering our 15 footers.
Thanks,
BobL
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| wpruitt |
Posted on 02/28/11 - 3:39 PM
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Happy to post pictures...probably late tomorrow.
Going to try a used 13.25x17 stilleto. More interested in pulling than top speed but worried about over revving. Looks like it will be real close. IDK about a 16". Maybe others with experience can weigh in.
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| wpruitt |
Posted on 03/02/11 - 8:36 AM
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See link below for photos on my mounting solution.
http://www.whalercentral.com/infusion...e_id=12317
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| Tom W Clark |
Posted on 03/02/11 - 12:37 PM
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Boy, looking at that last photo it sure looks like the motor should go UP another set of bolt holes.
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| surfncnow |
Posted on 03/02/11 - 2:04 PM
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Tom W Clark wrote:
Boy, looking at that last photo it sure looks like the motor should go UP another set of bolt holes.
I'm not trying to hijack the OP thread. But I'm trying to mount the same motor. I'm 2 bolt holes up with about half inch to 3/4 inch above the keel. So, if I go another set of bolt holes up. That should put me at or above an inch above the keel.
Also Tom, what do you think about this prop setup? Yamaha Performance Series 13 1/4 X 16 stainless steel prop.
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| Tom W Clark |
Posted on 03/02/11 - 5:07 PM
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If the cavitation plate is 1/2" to 3/4" above the keel in the "two holes up" position, then it will be 1-1/4" to 1-1/2" above in the "three holes up" position. The bolt hole spacing on all large outboards is 3/4".
Looking at wpruitt's photos, his cavitation plate looks like it is barely 1/2" above the keel now.
Remembering that the water surface of the water will rise after it comes out form under the hull and before it gets to the motor, I suspect the cavitation plate will still be dragging in the "two holes up" position.
No, the 13-1/4" x 16" Yamaha three blade Performance Series is not the right propeller. You want the 13-/4" x 18" Performance Series or the 13-1/4" x 17" Stiletto Advantage or Turbo Turbo 1.
They are all the same propeller (same design, all made by Precision Propeller Industries, Inc. which is owned by Yamaha), so you may as well get the Stiletto as the Stiletto will be the least expensive.
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| wpruitt |
Posted on 03/03/11 - 8:23 AM
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Tom,
I have one more hole to give. Should I start where I am or raise it up?
Warren
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| Tom W Clark |
Posted on 03/03/11 - 1:29 PM
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I think you should try it both ways and let us know how it does.
You may as well start where it is now, especially if you are going to use an aluminum propeller.
I was just surprised to see the A/V plate still so low.
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| Joe Kriz |
Posted on 03/03/11 - 2:22 PM
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It appears to me that there is a lot of difference between engine manufacturers as to how high the engine is compared to where it is actually mounted on the engine bracket.
Meaning they all don't seem to be the same height if mounted in the same holes.
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| Tom W Clark |
Posted on 03/03/11 - 4:51 PM
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There is some variation among the manufacturers and even among the different models from a single manufacturer, but the difference is not great, probably no more than one bolt hole, if that.
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| wpruitt |
Posted on 03/03/11 - 5:39 PM
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I removed a 2001 Johnson 50 and replaced with the Yamaha. In the stand I built, the yamaha had to be three holes down or the skeg would drag the pavement. The Johnson was mounted in the top hole and cleared. So there is a diffence in bracket to lower unit legnth.
I have a used 13.25x17 stilleto I will be installing. The aluminum prop is a 15" pitch so it is worthless on this boat unless I need to pull some stumps.
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| WhalerEric |
Posted on 03/03/11 - 8:09 PM
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Yamaha's will not do as well with the higher mounting location as say Johnson or Evinrude. The Yamaha will tend to suck air through the cooling intake, resulting in burnt out impeller and overheat, if mounted more than 1/2"-1" above the bottom. I would mount it so the cavitation plate is flush to 1" max above the bottom, that is to their spec I believe.
The mounting height has nothing to do with the skeg depth.
Edited by WhalerEric on 03/03/11 - 8:20 PM |
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| Tom W Clark |
Posted on 03/03/11 - 8:35 PM
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The Yamaha will tend to suck air through the cooling intake, resulting in burnt out impeller and overheat, if mounted more than 1/2"-1" above the bottom.
No, that's not true. The propeller will give up and ventilate long before the motor looses cooling water.
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| surfncnow |
Posted on 04/14/11 - 4:43 AM
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wpruitt wrote:
I removed a 2001 Johnson 50 and replaced with the Yamaha. In the stand I built, the yamaha had to be three holes down or the skeg would drag the pavement. The Johnson was mounted in the top hole and cleared. So there is a diffence in bracket to lower unit legnth.
I have a used 13.25x17 stilleto I will be installing. The aluminum prop is a 15" pitch so it is worthless on this boat unless I need to pull some stumps.
Have you tested out the new Yamaha 70HP?
I built new interior for mine. Last night I took it out and couldn't be any happier. I still need to get a tach but the motor height seems about right. The peanut crowed watching my speed passes called the side rails "Oh Crap Rails" and I must agree with that statement. IMO, the Yamaha 2 Stroke is the perfect weight and HP for this hull.
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| Eric_M |
Posted on 06/05/13 - 10:16 AM
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Thank you for all the great information on this thread! Sorry to drag up an old post.
I am in the process of mounting a Yamaha T90 on the back of a 15 cc right now, and this was a very helpful article.
Right now I have a fully filled in transom. And I was trying to figure out how I was going to get the "blind holes" drilled. From this thread it looks like I will be able to get the other slots lined up.
Thank you!
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