What 18mm spark plugs would you recommend for use in an original RAJO, Model BB, cylinder head with dual plug capability?
I just did a Laurel Roof engine and the old Firestones that where pink insulater and plutonium filled work great for me, the old boy I got them from had a couple cases of them, I am sure he would part with some.
Thanks Joe. I sent you a PM.
Mark
I had an issue with 18m plugs for my SR Fronty. They require a longer reach to the edge of the combustion chamber. They were difficult to locate. Let me know if you have this problem and i will look up what I found so far.
Mark
It look as if I may need 3/4" reach. I see the Champion D21 is only 1/2" reach. Did your Fronty also require a longer reach 18mm plug? Any suggestions would be appreciated.
Mark
Mark
From what I discovered, Champion plugs numbers 1 to 5 are 3/4 inch, 6 to 9 are 18mm. Some were made in long reach. and had an "L" after the number
You most likely (but check) will need a C7L if there is such an animal or 7 Com L that I know was made.