Blaster Intermitten loss of power

Me and my buddy just picked up a couple of WB1s

we are having a problem with his losing power

its a 62t/61x

pro tec head and exhaust. Dual 38s
Cylinder was ported back in the day by DBP (Dallas Baker Performance i believe) at the moment im not sure what the carbs are set at or whats done inside the ebox.

The ski runs awsome and has plenty of power, then it will randomly have a loss of power almost like its out of fuel but wont shut off.

Any idea were to start looking?

Ignition? Carbs? etc
 
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