🔌 Champion Spark Plugs 516 - D16 Plug Type Review

Don't be fooled by the product description. The dimensions explain the full size of the box which normally contains (6) plugs. Remember that you pay three times more for JUST ONE fork. Tried to return - not an option.

Rotocultivator with 16 HP Dual Wisconsin Flat Head Engine. After a thread repair, these spark plugs were a perfect fit to complete the job. Now it starts straight away, better than a modern engine. FYI, the thread repair kit is the same size as the oxygen sensor.

They were last changed in the engine, I probably fitted them in the 70's so I hope these new ones last as long. Fits Farmall M and smaller starters on John Deere R, will likely fit or be a suitable fork for all types of farm tractors from the 30's to the 70's.

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!