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Another possible thing
I don't know much about your situation i.e. is this problem new to you, or is the motor new to you, etc.
But the symptom you describe could also be what they call the sync n link, especially if someone has been screwing around with the linkage at all.
Basically what it is is the setup of the linkage so that the timer base advnces the spark correctly as the carburators open, I had that problem on my Evinrude 225 and I'm not sure how Merc does it exactly. It usually involves lining up certain referance marks and it normally doesn't change unless someone removes or adjusts the linkage or spark advance, so if that could have happened it's a place to look.Best bet is to get a manual and follow the procedure, it's always good to get a manual anyway.
If you're sure this is a new problem and noone has touched the linkage, I would guess carbs,
Bill
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