1. piñón, diente de engranaje   scooter   chain   tricycle   sprocket   Hint Half-n-half Clue   2. casco   helmet   seat   sprocket   exhaust pipe   Half-n-half Clue   3. presión del neumático   helmet   horn   tire pressure   wheel   Half-n-half Clue   4. palanca de cambio de velocidades   chain   pedal   lock   gear lever   Half-n-half Clue   5. motocicleta   motorcycle   engine   inner tube   horn   Half-n-half Clue   6. tubo de escape   inner tube   valve   sprocket   exhaust pipe   Half-n-half Clue   7. cable   scooter   cable   spoke   horn   Half-n-half Clue