i have a 1976 20 hp viking outboard no spark on one plug ran good when i put it away any help out there would be great thx all motor only has about 100 hours since new
I'm going to take a guess that it is based on the Chrysler 20 .69-76.
Check the points,clean and adjust.You could switch the coils and see if the trouble follows.Chrysler uses Champion L4J plug and a Tillotson MD carb.
Might be able to tell builder by model number.
