67 33 hp ski twin 100 or 50:1

divertodd

Seaman Apprentice
Joined
May 9, 2007
Messages
42
I have a 1967 Evenrude 33hp Ski Twin. Should I be running 50:1 or 100:1 ?


Thanks

Todd
 

tx1961whaler

Vice Admiral
Joined
May 31, 2008
Messages
5,197
Re: 67 33 hp ski twin 100 or 50:1

50:1, TCW-23 rated outboard oil. 87 octane gas
There are no 100:1 johnson/evinrudes. They tried 100:1 for a couple of years, but there were problems and they went back to 50:1 . 1950's motors ran on 24:1
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: 67 33 hp ski twin 100 or 50:1

prior to 1955, 16:1 55-64 was 24:1, 64 newer is 50:1, TC-W3
 

divertodd

Seaman Apprentice
Joined
May 9, 2007
Messages
42
Re: 67 33 hp ski twin 100 or 50:1

Thank you guys...I thought that was it but I am having one of those weeks :(

Anyway, I appreciate your quick response!

Todd
 
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