What do BDC and TDC mean in motorcycle jargon?

Answer

According to Timberwoof, the maintainer of the rec.motorcycles FAQ:

  • BDC means Bottom Dead Center, the position closest to the crankshaft that a piston travels in its cylinder. Alternatively, Brain-Dead Cager. "When the piston hits BDC."

  • TDC means Top Dead Center, the position closest to the cylinder head that a piston travels in its cylinder.
 

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