I have a 1986 Mecury 50 HP that I bought used and runs like crap. The guy I bought it off of said it ran great when he took it off the water 2 years ago. I have cleaned the carbs, pumps, needle valves with spray carb cleaner and it still has this problem. It starts and idel's fine, but when I put it in gear and give it gas it goes from idel to wide open, no in between. When running wide open it will get my 16 foot fiberglass tri hull up to about 15 MPH not enough to get up on plain, it also hesitates for a split second then picks back up like it has dirt passing through it. It does'nt though because i have changed the bulb the lines the tank and the gas. I think I need to rebuild the two WMA one barrel carbs. Does anyone have expirience with this? Is there anything I need to be careful of? Any help greatly appreciated. I've already ordered the kits.