Reply To: Gas / fuel leak help on a 1954 25hp Johnson RD-15

[Bob Wight]

Modern day outboards are way more efficient than those like yours from the 1950s. With modern technology and full synthetic oil, my current Evinrude ETEC puts out zero smoke and zero fuel/oil slick. As others have noted, you will do better with a synthetic blend or full synthetic oil and once you have the carburetor dialed in, it will be somewhat better but you can never totally eliminate the unburned fuel/oil mix that are just naturally inherent with the old design.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
1982 Evinrude 25hp

“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."