My Johnson 1997 60 hp motor keeps losing its fuel prime. I recently disconnected the oil supply so I can premix the gas and now after about 3 or 4 min the boat stalls out if I dont pump the bulb up. Before this I thought the oil supply was disconnected but was running it with both mix and oil pump and would run for about 45 min and lose all power and run on one cylinder. I was stuck on the river and I changed the plugs and it still ran the same. I brought it home and the next day put the earmuffs on, and it would run strong but smoky. thats when I disconnected the oil pump and it runs clean and strong but loses prime. Please help, thank you.