[Dutch515]

I all in new to the site and had a question I hope you can answer for me.
I just picked up a 1953-54 Evinrude 25 hp big twin and a 1953-54 Evinrude 15 hp fastwin. What gas oil ratio did these early models use. I heard in the sixties 50:1 was common. I would just like to use the correct ratio. Dutch

[Dutch515]

id also like to know the high and low screw settings for both. Thanks, Dutch

[wbeaton]

Nice motors. I have both. Post your model and s/n numbers and we can tell you what years you have.

24:1 in both. Synthetic oil will smokeless and won't leave a big oil sheen on the water. 1.5 turns out on the low and 1 turn out on the high is a good starting point for the jets. You have to make the final adjustments on the boat. Someone will come by with Joe Reeves carb set up procedure.

[HighTrim]

http://forums.iboats.com/showthread.php?t=167352

[Dutch515]

Thanks guys for the info, I usually do just vintage sleds but a friend has 9 of these old motors and wanted me to fix em all up. The 15 hp evinrude serial # is 15012 - 02891 and the 25 hp evinrude is 25012 - 32748. I also have a Montgomery ward sea king if anyone can help I think its a 51 but heres the #'s
Model # 15GG - 9015
Serial # - 389989

Thanks again guys your awesome. I think Ive found a great site to start me new obsession. Dutch

[HighTrim]

Evinrude #15012 is a 15hp 1953-54
Evinrude #25012 is a 25hp 1953-54

[wbeaton]

15012 - 02891 = 1953 Evinrude Super Fastwin 15 hp
25012 - 32748 = 1953 Evinrude Big Twin 25 hp

15GG-9015A = 1951 Montgomery Ward Sea King 5 hp

Send me a PM with your email address and I'll send you the parts manuals for your Evinrudes.

[tmcalavy]

You can get an owners manual/guide for that Sea King from acmeoutboards.com
Nice little motors, very reliable.