18mm Doering Spark Plug Set
Includes 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.
Tech Notes: Set gap at .025inch. *NOTE: Some head fins must be clearanced to accept the early large hex 1-3/8inch plugs.
FITS
Harley Davidson G 1936
Harley Davidson G 1937
Harley Davidson G 1938
Harley Davidson G 1939
Harley Davidson G 1940
Harley Davidson G 1941
Harley Davidson G 1942
Harley Davidson G 1943
Harley Davidson G 1944
Harley Davidson G 1945
Harley Davidson G 1946
Harley Davidson G 1947
Harley Davidson J 1926
Harley Davidson J 1927
Harley Davidson J 1928
Harley Davidson J 1929
Harley Davidson JD 1924
Harley Davidson JD 1925
Harley Davidson JD 1926
Harley Davidson JD 1927
Harley Davidson JD 1928
Harley Davidson JD 1929
Harley Davidson JD 1930
Harley Davidson RL 1930
Harley Davidson RL 1931
Harley Davidson RL 1932
Harley Davidson RL 1933
Harley Davidson RL 1934
Harley Davidson RL 1935
Harley Davidson RL 1936
Harley Davidson U 1937
Harley Davidson U 1938
Harley Davidson U 1939
Harley Davidson U 1940
Harley Davidson U 1941
Harley Davidson U 1942
Harley Davidson U 1943
Harley Davidson U 1944
Harley Davidson U 1945
Harley Davidson U 1946
Harley Davidson U 1947
Harley Davidson U 1948
Harley Davidson VL 1930
Harley Davidson VL 1931
Harley Davidson VL 1932
Harley Davidson VL 1933
Harley Davidson VL 1934
Harley Davidson VL 1935
Harley Davidson VL 1936
Harley Davidson W 1937
Harley Davidson W 1938
Harley Davidson W 1939
Harley Davidson W 1940
Harley Davidson W 1941
Harley Davidson W 1942
Harley Davidson W 1943
Harley Davidson W 1944
Harley Davidson W 1945
Harley Davidson W 1946
Harley Davidson W 1947
Orders over $145.95 qualify for free shipping.
Orders under $145.95pay a flat shipping rate of $10.95 Offer only applies to 48 contiguous states. Hazardous Materials ship UPS Ground only.
Orders that contain backorders, the order will be held until all parts are in. A customer representative will reach out to you if this is the case. At that time a decision can be made whether or not to split the order.
Alaska orders will be charged a flat $35 charge and will be shipped Post Office Priority Mail. We do not ship Oversized mail to Alaska.
Hawaii orders will be charged a flat $35 charge and will be shipped Post Office Priority Mail. We do not ship Oversized mail to Hawaii.
Puerto Rico orders will be charged a flat $35 charge and will be shipped Post Office Priority Mail. We do not ship Oversized mail to Puerto Rico.
