you've got a thru-hub exhaust if you will find exhaust holes to the engine gearcase round the prop shaft. Non thru-hub is good throughout the prop hub. Non Thru-hub Exhaust Reattach the fuel hose and gas bowl. With https://laylakbwn954696.verybigblog.com/29257437/yamaha-250hp-outboard-motor-for-sale-an-overview