Home › Forum › Ask A Member › 1957 johnson 18hp fuel mixture
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July 14, 2022 at 6:26 pm #262929
hello, i’ve been running this engine on 24:1 mixture with tcw3 2stroke oil. does anyone recommend something different. thanks
mn
July 14, 2022 at 6:29 pm #26293016-1
July 14, 2022 at 7:41 pm #262938I run 16:1 I believe that’s what they are from the factory aswell
July 14, 2022 at 8:15 pm #262940I run all of my mid 1950s motors, including my 1957 18hp at 16:1. Oil is cheap compared to replacement parts.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."July 14, 2022 at 9:25 pm #262943The instructions say to mix 1 quart of oil to a six gallon tank of gas and for smaller quantities mix it 16:1. One quart to six gallons of gas is 24:1 I run all my 1950s OMC motors with a 24:1 mixture.
July 14, 2022 at 11:57 pm #262964Here’s a copy of the tune-up data from a Johnson Condensed Service sheet, including recommended oil ratios, that I’ve always gone by. Evinrude wouldn’t be any different. There’s always a debate on the gas-oil ratio topic, but on any motor with bushings instead of bearings, I’ll run 16:1.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."July 15, 2022 at 12:14 am #262967OK, digging a little deeper in my files, I found this later version of an Evinrude oiling chart that indicates 24:1 is OK for a 1957 Fastwin. Don’t know how/why/when OMC might have changed this specification, but I’ll continue with 16:1.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."July 15, 2022 at 6:08 am #262975Thank you all for the input. I know this has been a debate for quite a while. Just wanted some info.Going to run the beans out of it next week. Think I’ll try 16:1
mn
July 15, 2022 at 9:42 am #262989I have heard that if they used a pressure tank use 24:1.
July 15, 2022 at 12:24 pm #262991Hi Bob W — also happens to be my name. FWIW, friends and I in Michigan are all running 32:1 in all of our Johnsons and Evinrudes; 1956 Lark and Javelin 30hp, 1958 Lark 35hp, various smaller motors from 1956-58, Using TCW-3 spec oil. Less smoke and no lube-related problems in hundreds of hours at this ratio, and less oil in the lake too, of course.
I need help with a different issue. My 1958 7-1/2 Johnson, AD-12, has been hard to start for a couple of seasons, and began stalling when running at about shifting speed. It would stop suddenly, no signs of being rich or lean, no one-cylinder miss, just sudden death. And a rowboat ride home. I had rebuilt the carb (including a new float) when I got the motor a few years ago and it ran well until it started stranding me last year. Now it’s unusable.
I went through the carb again, everything looks as clean and beautiful as it did before. The sediment bowl and fuel bowl fill normally, inlet needle does not leak. But twenty pulls later, with choke on and throttle at start setting — she never popped once, and the plugs are completely dry. I took reed plate off, all looks good to me; but it’s as if fuel is not being drawn from bowl when cranking. But the motor runs fine, from idle to full throttle, when it does run. I’, looking through the carb again, hoping to find some clogged passage or something, but all looks great. Any ideas? I have started it with starting fluid a few times, after which it runs fine until it decides I need more rowing exercise. Argh.
Any advice appreciated,
Bob / Duralark
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