2004 Yamaha 40 4 stroke, dies out when hole shotting

[fpelton]

The motor dies out when doing a "hole-shot" (really fast acceleration).

To date I have:
Sparked check out
compression is good
Fuel pump pressure is good
I just finished completely rebuilding the carbs (with cleaner and pressurized air)
Changed all filters, replaced 6 gal tank, checked little squeezy on fuel line (pumps up nice and firm when squeezed)

How does timing factor in? I have a light, but not the know how.

Is it time bite the bullet time that I have to bring it in to a shop or does anyone have any other thoughts on what I can check out?


Thanks again,
Bob

[boats.net]

The accelerator pump passages may be plugged up. Did you remove the plungers from float bowls when carbs were apart?