unknown part

  1. S

    Newbie, Found this mystery little piece in the engine . . . (THE PLOT THICKENS!)

    Hey everyone! I'm a newbie, both to this forum and to working on engines. And to riding lol. I'd really appreciate any input on this. I made a mistake - I was taking apart the engine on my 1978 XS400 and as I was splitting the crank case, I found this little piece had fallen onto my workbench...
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