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What is the correct spark plug for the old Evinrude RBM? Seems I have an AC73…like to switch to a Champion…my charts don’t go back that far….thanks, Gary
A Champion C-4 is a nice original looking plug and runs very well in my motors. That plug has the 7/8 " thread. This plug is pretty common as it is the spark plug use in Model A Fords. Available e-bay of Snyder’s antique Ford parts.
I use any of the following for my 1914
AC 75 COM
Champion W14
And whatever else uses 7/8 threads
I think depending on the year it matters as the old ancient ones used pipe threads, 1910 thru 12 I think used pipe threads..
The W14 will work… not period correct but will run, use the same in my Caille Liberty Twin.
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Thanks Joe and Richard; I’ll take your advice….hopefully run it at the next Big Fish Lake meet…I bought a nice 1921 with magneto…runs great. Gary from Hadley…