you've got a thru-hub exhaust if there are actually exhaust holes on the engine gearcase throughout the prop shaft. Non thru-hub is good round the prop hub. Non Thru-hub Exhaust Propeller Hardware: This hardware is https://tasneemhami445902.ezblogz.com/61369394/the-best-side-of-shop-yamaha-outboard-motor-discounts-now