what plugs for 66 40hp evinrude

[skinny1965]

last time out I had bit of issue with dropping one cylinder at low speed.
once reved up it seems to clear and all is good.
the motor has new coils and I never replaced the plugs when I got the motor.
what is a modern plug that will work well

 

[lindy46]

Re: what plugs for 66 40hp evinrude

Champion J4C or J6C if you do a lot of low speed operation. J6C is a little hotter and tends to not foul out as easily.