I have a 86 johnson 60hr. 3cyl. I sprayed starting fluid around hoses and carbs. it seemed to kill engine when i spray around the primer pump,i changed it, it made no change. I check all the fuel and vac. hoses.I found a few loose or broken clamps and made the repairs, still will not excell under a load,in water. runs well at any rpm, but not under a load. If this helps, the thing sat for about 5 to 6 yrs. you hold the choke in when running in the water it runs really well. I think its in the lower carb