7/8 inch Doering Spark Plug Set
Includes top ventilated brass collar for cooling as original Doering design! Terminal nut is removable. Original globe design of the 1930's. Features a #3 heat range. Packaged in a gift box. *NOTE: 7/8 inch spark plugs fit 1923 and ealier singles and twins 1924-1947 use 18mm plugs. Best for Pre-1925 JD & F models. Doering plugs feature a nickel plated base with cooling holes as original design for air cooled engines. *NOTE: Sold as a pair. **NOTE: Air cooled spark plug features a full seize hex. Full size hex is for single and twin flat heads For IOE types with space for the large hex. *NOTE: Hex size may interfere on some Flathead models. 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.
FITS
Harley Davidson F 1909
Harley Davidson F 1910
Harley Davidson F 1911
Harley Davidson F 1912
Harley Davidson F 1913
Harley Davidson F 1914
Harley Davidson F 1915
Harley Davidson F 1916
Harley Davidson J 1917
Harley Davidson J 1918
Harley Davidson J 1919
Harley Davidson J 1920
Harley Davidson J 1921
Harley Davidson J 1922
Harley Davidson J 1923
Harley Davidson J 1924
Harley Davidson J 1925
Harley Davidson J 1926
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 UL 1937
Harley Davidson UL 1938
Harley Davidson UL 1939
Harley Davidson UL 1940
Harley Davidson UL 1941
Harley Davidson UL 1942
Harley Davidson UL 1943
Harley Davidson UL 1944
Harley Davidson UL 1945
Harley Davidson UL 1946
Harley Davidson UL 1947
Harley Davidson UL 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
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