According to the Champion Cross reference that I have, the B6S is the equivalent of the J8C and the B7S is the equivalent of the J6C
. The numbers for heat range for NGK and Champion go in opposite directions.
Hmmm…….this site shows the B6S as a replacement for the Champion J6, J7, and J8 series of plugs. Best thing to do is install a new set, run the motor for a while and then read them. May have to make an adjustment depending on how the motor is being used. Usually a hotter plug for extended trolling or a colder plug for hard service such as water skiing.
https://www.sparkplug-crossreference.com/convert/NGK_PN/b6s
My guardian angel must be watching me today as my local auto supply (Lordco) can get all the B6S, B8S, and BM6A bantam plugs I want out of their Vancouver warehouse. I ordered several boxes of ten packs so that should keep me going for a while. ☺
