Re: 1960 Evinrude Fastwin 18hp Troubles

[Anonymous]

I’m sure someone wiser than I will respond, but if you see this before you go out for new plugs:

j4c is the "standard" plug, j6c is a hotter plug (often used if you spend a lot of time idling).
j8c is hotter still, never heard of anyone using them…. too hot a plug can cause predetonation and damage to the pistons…