Naraku Full Circle Crankshaft for Piaggio AC / LC 2T 50cc. Piaggio Fly 50cc 2T (2005-06) Naraku Full Circle Crankshaft. Piaggio Fly 50cc 2T (2006-07) Naraku Full Circle Crankshaft. High quality racing crank manufactured by Naraku, suitable for scooters fitted with Piaggio air cooled or liquid cooled 2-stroke 50cc engines.