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What happened with your primer? I had the same problem with my 550 and needed to adjust the mixture screws more open to allow more fuel. If it starts and dies out fuel sounds like main problem.
Recommended screw adjustments for a JS440:
YEAR.......low speed(turns-out).......highspeed (turns out)
1977-1979........5/8...........3/4
1980................5/8............1
1981-1989..........1............5/8
1990-on............7/8...........3/4
These are only starting points for the mixture screws and the proper adjustment could be more or less from what the starting point is.
Good luck
 

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The low speed mixtue screw is located on the same side as where the throttle connects to. The high speed is on the opposite side of the carb.
 
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