{"product_id":"18mm-doering-spark-plug-set","title":"V-TWIN 18mm Doering Spark Plug Set","description":"V-TWIN \u003cp\u003eLarge hex original design for air cooled engines  #3 heat range terminal nuts and seal washers included.\n\u003cbr\u003eIncludes top ventilated brass collars for cooling  as original  Doering design! Terminal nut is not removable. Plug set has a round feeler gauge. Spark plugs have a 18mm thread and the large hex measures 1-3\/8 inch  which is perfect for early restoration and riding. Set is for use with 1924 Harley models that require 7\/8 inch thread spark plug. *NOTE: Sold as a pair.  *NOTE: Fits early Knuckleheads  that can accept the 1-3\/8 inch large hex. *NOTE: Air cooled spark plug set features a nickel plated full size hex. Full size hex is for single and twin flat heads  For IOE types  with space for the large hex. Doering Spark Plug Company was founded in Brooklyn  NY in 1918″ making plugs for tractors. In the later years  they made plugs for automotive applications  for motors that burned an excessive amount of oil. They are manufactured to the original standards of that era  but not in Brooklyn any longer. \n\u003cbr\u003e Tech Notes: Set gap at .025inch. *NOTE: Some head fins must be clearanced to accept the early large hex 1-3\/8inch plugs.\u003c\/p\u003e\u003cbr\u003e\nFitment:\u003cbr\u003e\n1924 Harley Davidson JD\u003cbr\u003e\n1925 Harley Davidson JD\u003cbr\u003e\n1926 Harley Davidson J\u003cbr\u003e\n1926 Harley Davidson JD\u003cbr\u003e\n1927 Harley Davidson J\u003cbr\u003e\n1927 Harley Davidson JD\u003cbr\u003e\n1928 Harley Davidson J\u003cbr\u003e\n1928 Harley Davidson JD\u003cbr\u003e\n1929 Harley Davidson J\u003cbr\u003e\n1929 Harley Davidson JD\u003cbr\u003e\n1930 Harley Davidson JD\u003cbr\u003e\n1930 Harley Davidson RL\u003cbr\u003e\n1930 Harley Davidson VL\u003cbr\u003e\n1931 Harley Davidson RL\u003cbr\u003e\n1931 Harley Davidson VL\u003cbr\u003e\n1932 Harley Davidson RL\u003cbr\u003e\n1932 Harley Davidson VL\u003cbr\u003e\n1933 Harley Davidson RL\u003cbr\u003e\n1933 Harley Davidson VL\u003cbr\u003e\n1934 Harley Davidson RL\u003cbr\u003e\n1934 Harley Davidson VL\u003cbr\u003e\n1935 Harley Davidson RL\u003cbr\u003e\n1935 Harley Davidson VL\u003cbr\u003e\n1936 Harley Davidson G\u003cbr\u003e\n1936 Harley Davidson RL\u003cbr\u003e\n1936 Harley Davidson VL\u003cbr\u003e\n1937 Harley Davidson G\u003cbr\u003e\n1937 Harley Davidson U\u003cbr\u003e\n1937 Harley Davidson W\u003cbr\u003e\n1938 Harley Davidson G\u003cbr\u003e\n1938 Harley Davidson U\u003cbr\u003e\n1938 Harley Davidson W\u003cbr\u003e\n1939 Harley Davidson G\u003cbr\u003e\n1939 Harley Davidson U\u003cbr\u003e\n1939 Harley Davidson W\u003cbr\u003e\n1940 Harley Davidson G\u003cbr\u003e\n1940 Harley Davidson U\u003cbr\u003e\n1940 Harley Davidson W\u003cbr\u003e\n1941 Harley Davidson G\u003cbr\u003e\n1941 Harley Davidson U\u003cbr\u003e\n1941 Harley Davidson W\u003cbr\u003e\n1942 Harley Davidson G\u003cbr\u003e\n1942 Harley Davidson U\u003cbr\u003e\n1942 Harley Davidson W\u003cbr\u003e\n1943 Harley Davidson G\u003cbr\u003e\n1943 Harley Davidson U\u003cbr\u003e\n1943 Harley Davidson W\u003cbr\u003e\n1944 Harley Davidson G\u003cbr\u003e\n1944 Harley Davidson U\u003cbr\u003e\n1944 Harley Davidson W\u003cbr\u003e\n1945 Harley Davidson G\u003cbr\u003e\n1945 Harley Davidson U\u003cbr\u003e\n1945 Harley Davidson W\u003cbr\u003e\n1946 Harley Davidson G\u003cbr\u003e\n1946 Harley Davidson U\u003cbr\u003e\n1946 Harley Davidson W\u003cbr\u003e\n1947 Harley Davidson G\u003cbr\u003e\n1947 Harley Davidson U\u003cbr\u003e\n1947 Harley Davidson W\u003cbr\u003e\n1948 Harley Davidson U","brand":"V-Twin","offers":[{"title":"Default Title","offer_id":55891011797160,"sku":"49-0878","price":178.95,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0747\/8273\/6552\/files\/49-0878.jpg?v=1787193490","url":"https:\/\/speedguyscanada.com\/products\/18mm-doering-spark-plug-set","provider":"THE SPEED GUYS CANADA ","version":"1.0","type":"link"}