What spark plug

[longshot 1]

I have a 1972 4 HP Evinrude Yachtwin and I am wondering what spark plug should it have? When I bought the outboard it had a RJ12 C this is at the top of the heat range.

 

[CATransplant]

Re: What spark plug

Way too hot a heat range for that outboard. J6C is the right plug for that one.

 

[longshot 1]

Re: What spark plug

Thanks for the reply. I thought it was way to hot so I will get the J6C thanks.