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75HP Evinrude #7237303
04/07/21 01:20 PM
04/07/21 01:20 PM
Joined: May 2010
Posts: 670
ND
DakotaBoy Offline OP
trapper
DakotaBoy  Offline OP
trapper

Joined: May 2010
Posts: 670
ND
Hey all, I had a learning moment a couple of years back when I bought my first boat. Used the motor tilt tabs for trailering instead of a transom saver, and broke one of the legs off and screwed up the swivel bracket. The motor is a 1979 Evinrude 75HP, model 75943R, Serial No. J0001976. I believe the swivel bracket needed is a 15", but I know a 20" was also made. Two questions:

Where exactly do I measure to see if I've got the 15" or the 20" part? I believe what I've got is a short-shaft, so I'm thinking I'll need the 15"?

Does anyone happen to have an outboard bone-yard that might have one of these swivel mounts they're looking to get rid of?
[Linked Image]


"Pretty cocky for a starving pilgrim!"
"An elk don't know how many legs a horse has!"
Re: 75HP Evinrude [Re: DakotaBoy] #7237306
04/07/21 01:28 PM
04/07/21 01:28 PM
Joined: Dec 2006
Posts: 29,750
williamsburg ks
D
danny clifton Offline
"Grumpy Old Man"
danny clifton  Offline
"Grumpy Old Man"
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Joined: Dec 2006
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williamsburg ks
if nobody on tman has one try these guys

https://www.marinepartsoutlet.com/


Those who would give up essential liberty, to purchase a little temporary safety, deserve neither liberty nor safety. Benjamin Franklin (1706-1790)
Re: 75HP Evinrude [Re: DakotaBoy] #7237312
04/07/21 01:34 PM
04/07/21 01:34 PM
Joined: Dec 2006
Posts: 2,850
Beaver Bayou MN
Mike Kelly Offline
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Mike Kelly  Offline
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Joined: Dec 2006
Posts: 2,850
Beaver Bayou MN
Tim's Outboard in Hackensack MN is the place to find about anything outboard related.

https://www.timsoutboard.com/


www.WildRiverTraps.com - Oversized Pans for you Mink, Muskrat and Bobcat Traps!
Re: 75HP Evinrude [Re: DakotaBoy] #7237346
04/07/21 03:03 PM
04/07/21 03:03 PM
Joined: Dec 2006
Posts: 11,165
Central NC
T
traprjohn Offline
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Joined: Dec 2006
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Central NC
www.iboats.com is where I found parts for a '41 Johnson and a '57 Rude, PLUS, there is about 5k mechanics there, as well.


www.sevenoakstrappingsupplies.com for trap mods and gear
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Re: 75HP Evinrude [Re: DakotaBoy] #7237353
04/07/21 03:31 PM
04/07/21 03:31 PM
Joined: Jan 2007
Posts: 5,152
Northern Minnesota
BernieB. Offline
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BernieB.  Offline
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Joined: Jan 2007
Posts: 5,152
Northern Minnesota
Tim's outboard is an outboard motor salvage yard and man do they have them by the thousands. Pretty good chance he's got what you need. https://www.timsoutboard.com/

Re: 75HP Evinrude [Re: DakotaBoy] #7237397
04/07/21 04:37 PM
04/07/21 04:37 PM
Joined: Feb 2007
Posts: 5,365
New York border
Cragar Offline
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Cragar  Offline
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New York border
Easy way to measure for short shaft (15") vs long shaft (20") is to measure the boat transom size. From the looks in your picture it looks like your transom is 15".

They also make an extra long shaft for sailboats which I believe is 26"

Scuba , correct me if I'm wrong , but I think I got it right.


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Re: 75HP Evinrude [Re: DakotaBoy] #7237509
04/07/21 06:49 PM
04/07/21 06:49 PM
Joined: Sep 2010
Posts: 2,779
Northern lower Michigan
Feedinggrounds Offline
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Feedinggrounds  Offline
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Northern lower Michigan
Google, Valley Sales, Houghton Lake Michigan. Guy has old school bus's full of boat motors hanging on the seats....He is loaded with old snowmobile parts also.


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Re: 75HP Evinrude [Re: DakotaBoy] #7238110
04/08/21 11:03 AM
04/08/21 11:03 AM
Joined: May 2010
Posts: 670
ND
DakotaBoy Offline OP
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DakotaBoy  Offline OP
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Joined: May 2010
Posts: 670
ND
Am I measuring the bracket and transom correctly? To me, it looks like a 15" swivel bracket on a 20" transom.
[Linked Image]
[Linked Image]
[Linked Image]
[Linked Image]

Last edited by DakotaBoy; 04/08/21 11:04 AM.

"Pretty cocky for a starving pilgrim!"
"An elk don't know how many legs a horse has!"
Re: 75HP Evinrude [Re: DakotaBoy] #7238154
04/08/21 12:11 PM
04/08/21 12:11 PM
Joined: Jan 2007
Posts: 5,152
Northern Minnesota
BernieB. Offline
trapper
BernieB.  Offline
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Joined: Jan 2007
Posts: 5,152
Northern Minnesota
The cavitation plate just above the prop should be about level with the bottom of the boat. You'll have to put the motor down to see. If it has another cavitation plate about 5 inches above the bottom one, it's a 20.

Re: 75HP Evinrude [Re: DakotaBoy] #7238228
04/08/21 01:44 PM
04/08/21 01:44 PM
Joined: Jan 2009
Posts: 4,515
Nebraska
Trapset Offline
trapper
Trapset  Offline
trapper

Joined: Jan 2009
Posts: 4,515
Nebraska
You could also look up your serial # on Iboats and it will tell you what shaft you have. Looks like lower unit has been replaced on yours but that shouldn't change what bracket you need.

Re: 75HP Evinrude [Re: BernieB.] #7241373
04/12/21 10:07 AM
04/12/21 10:07 AM
Joined: May 2010
Posts: 670
ND
DakotaBoy Offline OP
trapper
DakotaBoy  Offline OP
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Joined: May 2010
Posts: 670
ND
Originally Posted by BernieB.
The cavitation plate just above the prop should be about level with the bottom of the boat. You'll have to put the motor down to see. If it has another cavitation plate about 5 inches above the bottom one, it's a 20.

Bernie, what is a cavitation plate? I'm guessing it's the plate above the prop (red arrow)? Is the blue arrow showing a second cavitation plate?
[Linked Image]


"Pretty cocky for a starving pilgrim!"
"An elk don't know how many legs a horse has!"
Re: 75HP Evinrude [Re: DakotaBoy] #7241394
04/12/21 10:39 AM
04/12/21 10:39 AM
Joined: Jan 2009
Posts: 4,515
Nebraska
Trapset Offline
trapper
Trapset  Offline
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Joined: Jan 2009
Posts: 4,515
Nebraska
If you post a pic of the ID plate I can find out what length it is for ya. The mount you need should be the same on both length shafts though.

Re: 75HP Evinrude [Re: Trapset] #7241413
04/12/21 11:07 AM
04/12/21 11:07 AM
Joined: May 2010
Posts: 670
ND
DakotaBoy Offline OP
trapper
DakotaBoy  Offline OP
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Joined: May 2010
Posts: 670
ND
Originally Posted by Trapset
If you post a pic of the ID plate I can find out what length it is for ya. The mount you need should be the same on both length shafts though.

1979 Evinrude 75HP, model 75943R, Serial No. J0001976

Unless I'm looking in the wrong spot on iBoat, it doesn't directly identify if it's a long or short shaft.

Last edited by DakotaBoy; 04/12/21 11:08 AM.

"Pretty cocky for a starving pilgrim!"
"An elk don't know how many legs a horse has!"
Re: 75HP Evinrude [Re: DakotaBoy] #7242449
04/13/21 04:10 PM
04/13/21 04:10 PM
Joined: Jan 2009
Posts: 4,515
Nebraska
Trapset Offline
trapper
Trapset  Offline
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Joined: Jan 2009
Posts: 4,515
Nebraska
Your right. looks like they started incorporating length in model # in 1980. You have my kind of luck, missed it by a year.

I have a 1977 85hp Evinrude and its a long shaft. Mine is a V-4 but outside mount and shaft are the same. I'll go take some pics like yours and see if that helps.

Re: 75HP Evinrude [Re: DakotaBoy] #7242463
04/13/21 04:21 PM
04/13/21 04:21 PM
Joined: Jan 2007
Posts: 2,663
S.E. Ohio
M
M.Magis Offline
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S.E. Ohio
That is a long shaft motor.

Re: 75HP Evinrude [Re: DakotaBoy] #7242495
04/13/21 04:58 PM
04/13/21 04:58 PM
Joined: Jan 2009
Posts: 4,515
Nebraska
Trapset Offline
trapper
Trapset  Offline
trapper

Joined: Jan 2009
Posts: 4,515
Nebraska
[Linked Image]

[Linked Image]

My motor looks exactly like yours as far as shaft and lower unit and mine is a long shaft. It didn’t come with power tilt and trim in 1977 so we kind of Frankenstein’d it on to an 80’s mount with power trim. There is no ID plate on the 80s mount (blue part) so I don’t know what it came off of as far as shaft length goes. It I’m sure yours is long. Sounds like there were very few shorts made in 85hp and it wouldn’t work on your 20” transom if it was short anyway.

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