The Unwelcome Piece

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Dynaguy

Looks like the rear brake light switch spring to me. Usually connects from the rear brake pedal to the rear brake light switch down near the pedal. My son and I restored a 1978 Honda Trail 90 over the summer, he (age 15) is now starting a 1974 Yamaha DT175. Loads of fun and good therapy. Enjoyed best with a fine cigar.

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Dynaguy

They are surprisingly sought after. My kid learned a lot, like "don't blow parts all over the garage". On the 175 he is being very organized. Bikes are a blast to ride, work on or just look at. Hope you find out where that spring goes...