1991 bayliner trophy 2352 outboard conversion.

John Stidman

Member
Apr 29, 2018
322
164
51
Baketsfield ca
Name
John Stidman
Boat
26ft seaswirl striper,24 ft trophy walkaround,24ft glasply flybridge.
Why did you only go with a 26” setback?
pretty sure you won’t be able to raise the motor all the way up...
I might be wrong...

This is with motor tilted all the way about 2 inch gap. Motor is also mounted in highest position on bracket mount. Needs to come up about 4 more inches. Looking at Jack plates for that. They have them that give more setback or just motor height brackets.

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John Stidman

Member
Apr 29, 2018
322
164
51
Baketsfield ca
Name
John Stidman
Boat
26ft seaswirl striper,24 ft trophy walkaround,24ft glasply flybridge.
And if you have to you can get a manual jackplate for not too much to give you more adjustability. Got on one mine (to replace a powered jackplate that crapped out).

Which would be best. I need to come up about 3 to 4 more inches. From what I see on plane, water is about where my finger is. Keep in mind I haven't got the new trimntabs ordered yet. Going with Bennet limited space adjustable12ed electric. My hydrolic tabs are too long as the bracket mounted at manufactures specs at 24in above bottom of keel to top of platform. If it was easy I'd remount about 2 in higher. But it will be ok once I get a backplate.

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Fishbones

Your wife thinks about ME
Nov 7, 2005
8,441
654
58
Chula Vista
Name
Rich
Boat
One Off 28' Custom Built Skipjack (SOUTHWESTERN) & 18' Sylvan (Short Runs)
3-4 inches? That was a big miss...
 
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John Stidman

Member
Apr 29, 2018
322
164
51
Baketsfield ca
Name
John Stidman
Boat
26ft seaswirl striper,24 ft trophy walkaround,24ft glasply flybridge.
3-4 inches? That was a big miss...
Well, I went by A&J marines instructions. Mount top of bracket at 24inches for a 25in shaft.the motor is as high as it will go. The bracket platform is about 4 inches above waterline sitting still. I imagine higher in salt water. They knew I was going with a 250 and confirmed to follow the instructions. I've see video on youtube that went 25 in for 25 in shaft. I'm sure with full tank fuel and 50 gal bait tank full it will put more balanced weight in middle to front.

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Dan Salazar

Member
Aug 23, 2014
400
990
70
Costa Mesa
Name
Dan Salazar
Boat
Rum Runner
Well, I went by A&J marines instructions. Mount top of bracket at 24inches for a 25in shaft.the motor is as high as it will go. The bracket platform is about 4 inches above waterline sitting still. I imagine higher in salt water. They knew I was going with a 250 and confirmed to follow the instructions. I've see video on youtube that went 25 in for 25 in shaft. I'm sure with full tank fuel and 50 gal bait tank full it will put more balanced weight in middle to front.

View attachment 1261101
John in all due respect I think you might be overthinking this
Water level when you're still in the water is not a factor
The important part is when you're up on plane
The way you have your bracket set up your cavitation plate on the outboard should be about 2" above the lowest part of your V Hull
Fill it with fuel take it for run and if need be make adjustments later
 
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John Stidman

Member
Apr 29, 2018
322
164
51
Baketsfield ca
Name
John Stidman
Boat
26ft seaswirl striper,24 ft trophy walkaround,24ft glasply flybridge.
John in all due respect I think you might be overthinking this
Water level when you're still in the water is not a factor
The important part is when you're up on plane
The way you have your bracket set up your cavitation plate on the outboard should be about 2" above the lowest part of your V Hull
Fill it with fuel take it for run and if need be make adjustments later

Hmm, my understanding and reading all the engine height posts and vids say that my cavitation plate should be just about a half inch to an inch above water while on plane so that the re is no drag in it. Not referring to waterline while sitting. I'm referring to where it is on plane.
 

John Stidman

Member
Apr 29, 2018
322
164
51
Baketsfield ca
Name
John Stidman
Boat
26ft seaswirl striper,24 ft trophy walkaround,24ft glasply flybridge.
Which would be best. I need to come up about 3 to 4 more inches.
Which would be best. I need to come up about 3 to 4 more inches. From what I see on plane, water is about where my finger is. Keep in mind I haven't got the new trimntabs ordered yet. Going with Bennet limited space adjustable12ed electric. My hydrolic tabs are too long as the bracket mounted at manufactures specs at 24in above bottom of keel to top of platform. If it was easy I'd remount about 2 in higher. But it will be ok once I get a backplate.

View attachment 1261037

View attachment 1261038

View attachment 1261040

Right about where my thumb is in the pic is my cavitation plate. Where I'm pointing is the water lever under load and on comfortable plane.
 

John Stidman

Member
Apr 29, 2018
322
164
51
Baketsfield ca
Name
John Stidman
Boat
26ft seaswirl striper,24 ft trophy walkaround,24ft glasply flybridge.
John in all due respect I think you might be overthinking this
Water level when you're still in the water is not a factor
The important part is when you're up on plane
The way you have your bracket set up your cavitation plate on the outboard should be about 2" above the lowest part of your V Hull
Fill it with fuel take it for run and if need be make adjustments later

Just curious, for a transom mount that seems right. But from what I read about a flotation bracket so many inches per ft of setback as the water comes off the hull and bottom of bracket and is higher up that rt behind transom and hull. I have a 26in setback flotation bracket. I'm just trying to get the most out of my fuel economy and find best height. I may be wrong.
 

Dan Salazar

Member
Aug 23, 2014
400
990
70
Costa Mesa
Name
Dan Salazar
Boat
Rum Runner
Just curious, for a transom mount that seems right. But from what I read about a flotation bracket so many inches per ft of setback as the water comes off the hull and bottom of bracket and is higher up that rt behind transom and hull. I have a 26in setback flotation bracket. I'm just trying to get the most out of my fuel economy and find best height. I may be wrong.
I think you're OK
My opinion and 2 dollars might buy a cup of coffee
The mark you indicated was on a comfortable plane I think the concern would be cavitation when your wide open or during hard turn (if motor is set to high)
The one guy I know for sure that would absolutely 100% know is Craig Mauer Mauer Marine Costa Mesa
(He has mounted 1-4 outboards every week for about 40 years)
 

John Stidman

Member
Apr 29, 2018
322
164
51
Baketsfield ca
Name
John Stidman
Boat
26ft seaswirl striper,24 ft trophy walkaround,24ft glasply flybridge.
I think you're OK
My opinion and 2 dollars might buy a cup of coffee
The mark you indicated was on a comfortable plane I think the concern would be cavitation when your wide open or during hard turn (if motor is set to high)
The one guy I know for sure that would absolutely 100% know is Craig Mauer Mauer Marine Costa Mesa
(He has mounted 1-4 outboards every week for about 40 years)

Well, I said comfortable plane meaning wide open then just cutting back a touch so it wasn't wide open. But also I don't have trim tabs on it yet either. But it runs perfectly even rt now and that's just 2 guys and no gear, full tank or bait tank full. I just wanna make sure out in the ocean my motor is set right for best fuel and not get flooded out from swells behind. Sitting still the motor is s way low I'm sure. Thanks for advice and reply.
 

John Stidman

Member
Apr 29, 2018
322
164
51
Baketsfield ca
Name
John Stidman
Boat
26ft seaswirl striper,24 ft trophy walkaround,24ft glasply flybridge.
I think you're OK
My opinion and 2 dollars might buy a cup of coffee
The mark you indicated was on a comfortable plane I think the concern would be cavitation when your wide open or during hard turn (if motor is set to high)
The one guy I know for sure that would absolutely 100% know is Craig Mauer Mauer Marine Costa Mesa
(He has mounted 1-4 outboards every week for about 40 years)

Thanks
 

Dan Salazar

Member
Aug 23, 2014
400
990
70
Costa Mesa
Name
Dan Salazar
Boat
Rum Runner
Well, I said comfortable plane meaning wide open then just cutting back a touch so it wasn't wide open. But also I don't have trim tabs on it yet either. But it runs perfectly even rt now and that's just 2 guys and no gear, full tank or bait tank full. I just wanna make sure out in the ocean my motor is set right for best fuel and not get flooded out from swells behind. Sitting still the motor is s way low I'm sure. Thanks for advice and reply.
John
Attached is a picture of my boat on mooring 11 in Avalon
Same engine as yours (mines the bass boat model) might help you
20210116_105904_compress68.jpg

Just curious, for a transom mount that seems right. But from what I read about a flotation bracket so many inches per ft of setback as the water comes off the hull and bottom of bracket and is higher up that rt behind transom and hull. I have a 26in setback flotation bracket. I'm just trying to get the most out of my fuel economy and find best height. I may be wrong.
 

John Stidman

Member
Apr 29, 2018
322
164
51
Baketsfield ca
Name
John Stidman
Boat
26ft seaswirl striper,24 ft trophy walkaround,24ft glasply flybridge.
John
Attached is a picture of my boat on mooring 11 in Avalon
Same engine as yours (mines the bass boat model) might help youView attachment 1261258

Yeah, I'm not worried about the bracket. Just the motor height. Here mine in flat water. You can see yours is alot higher up than mine. I'm almost to the cowling. And I know all the videos or pics on outboard motor height says best I'd the cavitation plate just barely above water when on plane. I'm a good 4 inches too low on plane. I'll take another pic lil bit away from motor so I can see where I'm at as to where I should be as far as research says.

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John Stidman

Member
Apr 29, 2018
322
164
51
Baketsfield ca
Name
John Stidman
Boat
26ft seaswirl striper,24 ft trophy walkaround,24ft glasply flybridge.
Where my finger is is where the water line is under plane. I go wide open til it planes and get up to top speed. Then I barely cut back a hair as it's not wide open but stays on plane and same speed, just not as high rpm but close. From everyone saying my cavitation plate should be just above water line. So it doesn't give drag on it. This is my first conversion and mounting motor. I want best fuel and power I can get.

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John Stidman

Member
Apr 29, 2018
322
164
51
Baketsfield ca
Name
John Stidman
Boat
26ft seaswirl striper,24 ft trophy walkaround,24ft glasply flybridge.
Primer and non skid deck paint. Pretty much done except waiting on new trim tab system.
 

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John Stidman

Member
Apr 29, 2018
322
164
51
Baketsfield ca
Name
John Stidman
Boat
26ft seaswirl striper,24 ft trophy walkaround,24ft glasply flybridge.
Any way to get the transom to sit or float higher. I think after 5 layers of plywood with gkass in between. The Yamaha f250 outboard, the flotation bracket and possibly the kicker(not yet mounted) are too much weight it doesn't really sit low but with full tank of fuel which is in center and 50 gal bait tank above center empty and couple guys at the back my swimstep is at water level. So I imagine once I install the kicker, fill bait tank up and a few guys I'll sit lower. I know I've heard to move the weight towards the front like batteries. But that's all I'll be able to move. Was thinking about having bigger fuel tank made later but I'm not sure about adding anymore weight. Can't raise the bracket. It's a done deal. Installed at 24" as instructions by manufacturer.
 

John Stidman

Member
Apr 29, 2018
322
164
51
Baketsfield ca
Name
John Stidman
Boat
26ft seaswirl striper,24 ft trophy walkaround,24ft glasply flybridge.
Here's some numbers even with my transom kinda low. It doesn't point up in the bow. Boat sits pretty flat. But after installing the flotation bracket at 24 inches like manufacturer recommended. The water line with full fuel, 50 gal bait tank full the waterline is just a hair under platform. It does get lil water over the top when waves hit back. I don't think I'll get any in the hull. Still sits pretty high on top water. Anyways. Ran wot with heavy load. I get max rpm at 6100. And about 40mph to 42 mph half tank and empty live well. I can see the top part of the rear cavitation plate just at waterline maybe a hair above. I'm as GD as I'm going to get. Please let me know if these numbers are gd or bad. These are different speeds. It does plane easily and rides dead flat with tabs all the way up. 2 guys in seats. I don't mind water washing over the swim platform as long as I'll be ok out in ocean.

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John Stidman

Member
Apr 29, 2018
322
164
51
Baketsfield ca
Name
John Stidman
Boat
26ft seaswirl striper,24 ft trophy walkaround,24ft glasply flybridge.
I also bought these to add. Autopilot is here, winch will be in soon. Studying best way to install and what else needed.
 

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soul troller

Mine bends where yours ends
Mar 14, 2004
634
729
Murrieta Ca
Name
Lou
Boat
Pursuit 2870 WA
Not an expert by any means , but sounds like you have it dialed in pretty good to me .
Rpms are at the higher end of normal WOT range . That thing is scooting .
Where is the waterline on the hull now in relation to where it was originally before all the conversion work .
I wouldn't be worried about water on the bracket .
Have you looked at or talked to other guys at the ramp with brackets ?
Never looked super close where my cavitation plates were at cruise , but here's where my recent motors sit at rest .
May be apples to oranges , I don't know.
Just another opinion.

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John Stidman

Member
Apr 29, 2018
322
164
51
Baketsfield ca
Name
John Stidman
Boat
26ft seaswirl striper,24 ft trophy walkaround,24ft glasply flybridge.
Not an expert by any means , but sounds like you have it dialed in pretty good to me .
Rpms are at the higher end of normal WOT range . That thing is scooting .
Where is the waterline on the hull now in relation to where it was originally before all the conversion work .
I wouldn't be worried about water on the bracket .
Have you looked at or talked to other guys at the ramp with brackets ?
Never looked super close where my cavitation plates were at cruise , but here's where my recent motors sit at rest .
May be apples to oranges , I don't know.
Just another opinion.

View attachment 1266590

View attachment 1266591
I'm a few inches lower at rest