Overview Product Description Comet 780 Driven 301789A 3/4" center bore ideal for 18-30hp engines Comes with outboard spring 8-1/2" Diameter Product Videos Custom Field Product Reviews Write a Review Write a Review × 780 Driven Pulley 3/4" Bore, Comet Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *