Image Item No. Description  54802  Flywheel Inertia Motor 9 x 4 x 3 2/3 Catalog: Parts: Motor, Non-Electric  motor6  Pullback Motor 7 x 5 x 3 (Motor 6) Catalog: Parts: Motor, Non-Electric  47715c01  Pullback Motor 9 x 4 x 2 2/3 Catalog: Parts: Motor, Non-Electric  45721c01  Windup Motor 4 x 4 x 3 1/3 (Technic) Catalog: Parts: Motor, Non-Electric