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Old 07-28-2013, 03:39 PM
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Default Transom Placement and Shaft Length

Update: Recieved an email finally from the owner and former manufacturer of Island Runner Boats. My 26 was designed for a 25" shaft motor, and specifically for a Verado. Transom cut is a couple inches too narrow for a big V6 with a bolted on steering shaft. Hence why I now have a Jack Plate. Someone didn't measure until the motor arrived.

This is my first post, although I have been frequenting topics on this forum recently as a means of determining the right placement of my new motor. I have put together 3 videos based on a sea trial I performed yesterday, and was hoping to get some opinions based on the data I collected.

Boat Specs:
2009 26' Island Runner
Past motor 275 Verado 25" (stolen)
Re-Power 300 Yamaha F300 30"
Weight- listed as 5500 as fitted with bracket and twin 150 opti's
Entry 60 degrees, I believe 26 at transom.
Step Hull 5" and 10" forward
Transom 25" Transom to Keel 30"

I will not name the dealer who did my repower as I am still waiting on work and don't wish to create a negative opinion while I am sorting through questions and testing.

I look forward to everyone's thoughts. I have a whole list of added data I've been collecting, so if there are any questions, I should be able to answer them intelligently.

Thanks for taking the time to comment on my trial. Video descriptions add further details of each test.

Test 1 http://youtu.be/38Lkm06QCBA
Test 2 http://youtu.be/xA6HD_goVMA
Test 3 http://youtu.be/pFmiugT9lTw

Last edited by Island Runner 26; 08-04-2013 at 04:24 AM. Reason: Manufacturer Update
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Old 07-29-2013, 05:05 AM
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i cant see the videos, but pretty much the rule of thumb is, the cavitation plate should be just out of the water while the boat is on its slowest plane (as slow as you can go, while remaining on a plane).
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Old 07-29-2013, 08:41 AM
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I took some really good photos of the cav plate during different heights of operation. Forgot to mention in the post, but I added a 10" offset Atlas Hydraulic Jack Plate because when the engine showed up and was hung, it did not fit. Videos document different heights of Jack Plate operation.
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Old 07-29-2013, 06:44 PM
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This is about where I think I should be running at plane.
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Old 07-29-2013, 06:47 PM
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This would be equivalent to me running a 25" shaft, on the top hole, with the Jack Plate in full down position while running. Jack Plate mounted on top hole as well so the bulk of the plate is centered in the transom.
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Old 08-03-2013, 04:03 AM
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Update for anyone who watched the videos and was curious of the outcome: Dealer has removed 5" spacer, making the motor 25" as I suspected it needed. Water test completed. Runs perfect in the lowest setting. At plane, the jack plate can be raised 2 1/2" before the prop starts to catch air. I love this motor, but CANNOT say the same for Yamaha's customer service. You should be able to contact a rep without having to go through the dealer that you are in the middle of a dispute with. Lessons learned...

I'm going to make some videos detailing the performance while on vacation next week.

During test yesterday, 11.2-11.8 GPH @ 33-36MPH , 18.8 GPH @ 47 MPH , Top speed to date 54 MPH



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Old 08-04-2013, 04:31 AM
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2006 275 Verado, Integrated steering, narrower engine, sets back further.



2013 Yamaha F300, Steering shaft would not have full movement. Motor cowling would have hit transom if raised while turned.

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