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Guten Tag! Robert Bosch made the FF series for the small engine market. Many were OEM on Fairmont Railway speeders, some early Harley-Davidson bikes, and many others. These were very well made and many survive today in working order. here is some factory Parts information to keep yours alive and well.
The spark plug wire terminals(See illustration#75 part #WSR38/1) are special and accept a threaded end with 9MMx1.25 threads. Probably to resist vibration and dynamics from motorcycle installations.
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