92 Mercury 50 HP will not accellerate

[arjo]

Bought myself this engine some weeks ago, and the problem is that the engine suddenly would not accellerate beyond appr.3000 rpm.
It idles smooth,but runs a little bit weak maybe?

Previous owner had it to workshop, they changed fuel-pump,power-pack and rebuildt the carbs,no difference.
He would not spend more money on it, so I bought it,thinking that this problem could be solved, but now I am really
starting to wonder.

I have now done all the DVA-testing like the CDI-troubleshooting says ,using the CDI DVA-adapter,and it seems that
all values are inside spesifications.

Here are the values (cranking): STATOR DVA: low speed 245V(connected) 274V(disconnected)
high speed 52V(connected) 46V(disconnected)


Stator resistance: lowspeed-521 ohm highspeed-27,6 ohm


Trigger DVA : 8,5V connected and 12V disconnected on all 3 cyl.
Resistance on all are about 1175 ohm

Powerpack DVA to the coils are about 240V on all 3 cyl at idle.

Have done carb and ignition sync, set the timing correctly,
compression is 112psi-115psi-119psi (1 2 3)

I am lost here,anyone with some good advice here,will be much,much appreciated.
Have tried with the 2 yellow stator wires disconnected,no difference.

[boats.net]

Does warning buzzer work? may be going into safe mode.