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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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if you get to looking real hard, some carbs will have a "H" or "L" stamped/embossed on them near the screws. but some dont...
 

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Discussion Starter · #8 ·
That is it. My motor is a 550 not a 440. Does anyone know where i should start my settings at with aftermarket pipe & intake? Also I read a little about needing a fuel restrictor since my rev limiter has been removed. Do i need to add this? I have a drilled out aluminum bar ready to install if needed.
 

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I leave mine on the trailer but in the water on the boat ramp to fiddle with the mixture settings. that way i can work the throttle and play with he mixture but not go anywhere or have to balance.
 
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