75 horse VS 50 HP Evinrude

koolminx · Post by **koolminx** » Sun Apr 02, 2006 8:10 pm

I have a 1960 Evinrude 75 horse ourboard according to the Serial #. I was told by a fellow that the ENGINE is a 50 Horse Johnson... How can this be true? and How can I tell the diffrence.. Does anyone know the bore and stroke of the 50 Horse Johnson/Evinrude and the 75 horse. Apparently they are both V-4 engines, mine is... I'm in the process of selling it and would appreciate any help. e-mail me at malem2us@comcast.net at anyones earliest opportunity if you have some specs.

THanks!

Gary (koolminx)

a j r · Post by **a j r** » Tue Apr 04, 2006 4:19 am

The serial number and model number should indicate the year and HP. www.old-omc.de is one site where this information is listed.

Can't tell you anything about the bore and stroke.

JRPfeff · Post by **JRPfeff** » Tue Apr 04, 2006 8:51 am

Koolminx,

Is the serial no. from the engine or the lower end? I think they were compatible between the two, and you could have a mixed unit.

Dennis Evinrude can probably help you. Try getting in touch with him through the Antique Outboard Motor Club. I can give his phone number if that doesn't work.

Jim

john · Post by **john** » Tue Apr 04, 2006 6:39 pm

50 hp is 70 cubic inch and 75 is 89 cubic inch.

Most noticable difference on engine is choke, 50 hp is electric solenoid, and 75 is hot water choke. Clamp bracket on 50 has thumb screws, 75 has bolt on brackets. 75 has one piece pointed gearcase, 50 has two piece snub nose.

koolminx · Post by **koolminx** » Sat Sep 10, 2011 5:19 pm

Wow I did end up having a miss matched head and block I think. Thanks for replying, sorry I never got back, we PCS'd back home to Washington and I forgot about this site.
I now actually have a boat and run what I believe is a 1951 Elgin 2.5 horse as a putt around motor for my 1969 Reinell 18' boat.

Just wanted to say thanks for the help I got, and sorry for being a dickweed and forgetting...

koolminx