Pretty much anything not covered by the topics above. Short lived production bikes or vehicles, Electrical, Tires, Paint, Brakes, etc. Use this for tech questions, and "Shoot the Bull" for general conversation, no tech.
Harley-Davidson listed in their accessory catalogs, starting in '33, Linkert carburetors in a brand new style. they sold them for all their own models but also in the designations; M6 for 74" Indian, M7 For 45" indian, and M8 for indian 4. $12.50 each. Robbie