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Raising engine and replacing wood on transom

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Mryozamp View Drop Down
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    Posted: 06/26/2018 at 2:07am
I have a 1998 Smokercraft 20’ pontoon with a 2003 Yamaha 40 Hp 4 stroke. I recently purchased it. When taking it out it will run great for the first 20 mins wide open throttle. After that it would began to run rough and even stall. It would always start right back up and have similar symptoms shortly after. I began looking closer and there is a lot of spray while driving on top of the engine at almost any speed. I believe water was starting to get into the engine when this was happening allowing one of the coils to get wet. The board on the back transom is pretty rotted and I feel the engine should be raised at the same time. My several questions are:
1. Is there a good rule of thumb on how high your engine should be from a certain point. This same problem occurs even when I trim it all the way up. Right now it is mounted at the lowest point but if I were to raise it there would be a gap from the engine mount to the piece of wood with aluminum strip. Is that ok? Or should the engine mount sit flush on top of the wood/aluminum strip
2. When I pull the motor and replace that rotten caved in piece of wood should I keep it the same size or should I make it taller so I can keep the engine at the same setting and it will sit higher. Any thoughts on what to use for the wood? I was thinking of using 2 pieces of 3/4” marine grade plywood with a sheet of 1/4” aluminum on the backside sandwiched between the aluminum bracket and wood.

Any input would be very greatly appreciated.

Edited by Mryozamp - 06/27/2018 at 2:40am
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Mryozamp View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mryozamp Quote  Post ReplyReply Direct Link To This Post Posted: 06/26/2018 at 2:15am
I have a few pictures and a video of it running but It will not let me attach i the video There is a lot of water spraying around the engine cover no matter where I have the trim set. I can email or text to any one who would be interested. Thanks in advance!!!!

Edited by Mryozamp - 06/26/2018 at 3:06am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mryozamp Quote  Post ReplyReply Direct Link To This Post Posted: 06/26/2018 at 2:53am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mryozamp Quote  Post ReplyReply Direct Link To This Post Posted: 06/26/2018 at 2:59am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mryozamp Quote  Post ReplyReply Direct Link To This Post Posted: 06/26/2018 at 3:03am
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Anybody???
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Post Options Post Options   Thanks (0) Thanks(0)   Quote curtiscapk Quote  Post ReplyReply Direct Link To This Post Posted: 06/27/2018 at 2:17pm
you wont be able to raise the transom..... some spray is inevitable. you nay need a longer shaft motor.


 we need a shot further out that shows motor in relation to pontoons. You're cavitation plate should be level with bottom of toons. Here's mine and it sprays as well.


Craig n Paula
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Post Options Post Options   Thanks (0) Thanks(0)   Quote curtiscapk Quote  Post ReplyReply Direct Link To This Post Posted: 06/27/2018 at 2:20pm
My transom actually has a cut out to get it lower....

I used just 2 pieces of wood the aluminum is a good idea too.
Craig n Paula
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Mryozamp View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mryozamp Quote  Post ReplyReply Direct Link To This Post Posted: 06/28/2018 at 12:03am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Barnmb7117 Quote  Post ReplyReply Direct Link To This Post Posted: 06/28/2018 at 2:45am
It looks good to me.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote toonrider Quote  Post ReplyReply Direct Link To This Post Posted: 06/30/2018 at 1:56pm


To answer your question about raising the motor up off the transom is no, it will not hurt to do that. I had to raise my motor one hole to prevent water from washing up over the transom plate. The thing you need to be concerned with is cavitation of the motor that was mentioned. Raising the motor could cause the motor to cavitate, especially when making turns. This is when the motor does not have enough water at the prop, and your motor will rev and your speed will slow.
I should mention that I also get some water spraying the side of my motor when moving, but by raising my motor I did cure the water from washing over the transom.




Edited by toonrider - 06/30/2018 at 5:05pm
Randy
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