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2007 Yamaha 150 carb engine trouble starting

May be something obvious but need help finding it. I can get the engine to turn over and 25 amps to the windings but cannot get the motor to fire. I changed out all of the fuel with fresh and flushed through all of the fuel lines, fuel filter clean. I inspected the spark plugs and found they were fouled. I replaced all 6 and cleaned all of the trash away from the plug openings. All wiring to the engine is connected tight and amperage is good. As dangerous as it is, I used ether to jump start it and still had no luck. I kept the engine dry of fuel through the winter, but ensured fuel is primed throughout system. Took new spark plugs out to see if cylinders were flooded and there was very little fuel on plugs. Please help!! Thanks!!!
 
Does the engine kick with the ether or is there no spark? Those engines are sensitive to choke when cold. Is yur choke operating properly?
 
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