Header banner
Revain logoHome Page
Paul Varnado photo
1 Level
759 Review
34 Karma

Review on πŸ”Œ Champion Spark Plugs 516 - D16 Plug Type by Paul Varnado

Revainrating 5 out of 5

Old spark plugs are always harder to find

I've been using 18mm Champion spark plugs like this in my 75 year old Harley for over 40 years. I bought the candle catalog 516, also "D-16". I keep coming back to this candle ever since it was cataloged as "UD-16" in the 1970's. My old Harley uses 18mm oversized spark plugs, commonly known as "tractor plugs", which have been used in farm machinery for decades. . I liked to find them in boxes of 6 and fairly cheap. The price was right!

Pros
  • Nice to use
Cons
  • Nothing here