When did Indian begin making Z metal flywheels? I thought they were strictly a WWII production item, though the most recent 741 (advertised) flywheels from a trusted source even say 75137 and 75139 which are also in the above list as "Light" flywheels. How can they be 1941-1945 parts if the numbers show up earlier? Did Indian use left-over 1938 parts stock on the war bikes?
-JR
-JR
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