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Just a follow-up note on the connecting rod upgrade for this RD-18. Digging through some old files, I uncovered my long-forgotten copy of the Johnson Common Parts list and found that the upgraded 377272 con rod is listed as the common part for all models RD18 thru RD21. Lots of good information in this Common Parts list – wish I’d found it earlier!
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
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