Champion plugs
RD10 – J6C
QD12 – J6C
Evinrude Lightwin – J4C
Mercury – don’t know
I’d suggest you would do better using NGK plugs, B6S for the Champion J6C and B8S for
the J4C.
Edit – I used a Johnson Motor Spec sheet from 1960 to come up with the Champion numbers.
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."
