Fuel "spitting" up carb on fresh Dasa 1000 rebuild------please help if you can.

Hey guys-
I just took the ski to the water to do a water test while it was on the trailer and it fired right up. I had the flame arrestors off and immediately noticed fuel being ejected up and out of the front carb. It stumbled and would not stay running on its own. I restarted it a couple times hoping it would fix itself but of course its a real issue and I have no idea what would cause this condition.
Any ideas?
Thanks in advance.
 
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