Flooding 2001 f50

I had the 4 carbs on my F50 cleaned and services by my local yamaha dealer last season. They cleaned the carbs and replaced both prime starts for just over $500. I winterized the engine excactly the way they said "run fuel out of carbs and drain bowls. I filled here up Easter weekend and took her out, she started right up but after about a min it started loading up and died. After giving it alot of neutral throttle she started up again but would not idle. I took it home and cleaned each carb myself and found no debris or stuck needle valves on the floats. Put it back together and she fired right up again but loaded up after about a min. Gas was POURING out of the air cleaner area and filled my crankcase with fuel. Took it apart again and can't for the life of me figure out what's wrong. I'm thinking the prime starts are bad but there only a year old. I took both prime starts off and tried jumping them on a 12v bat and nothing happend. Any help would be great.

Re: Flooding 2001 f50

take the carbs apart,again.
clean them and the fuel lines.
check the fuel pump diaphram if your getting much gas in the oil.
you have a stuck or damaged needle valve or the seat oring has failed.
use a jumper wire set to test the enrichment valves correctly.
meaning measure the tip length before applying 12v and after 5 minutes or so.
its a heated wax pellet device and makes no sound its NOT a solinoid.
when your all done the throttle plates must be reset using a 4 channel manometer or it wont ever idle quite right.

Re: Flooding 2001 f50

Well cleaned all 4 carbs AGAIN replaced needle valves on the floats, tested the prime starts and it's STILL FLOODING. Anyone?