you do have a thru-hub exhaust if you'll find exhaust holes over the engine gearcase round the prop shaft. Non thru-hub is sound within the prop hub. Non Thru-hub Exhaust I would say you've got a gasoline supply https://esmeechxy445763.onesmablog.com/how-much-you-need-to-expect-you-ll-pay-for-a-good-new-yamaha-outboard-motors-for-sale-70128903