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check the oil bottle to if he ran outta gas could he have been lax on the oil side to ?.
9-10 times bogging after a dry tank is crap been drawn through the filtering and into the main/pilot jetting. not the larger clumps up the fine shit that sits in the bottom its like fine but enough to get past the filter and start to choke up the jetting and jetting ports.
usual port of call, dump the float bowl off and check the state of it as its gonna be dry, that will give you an idea of the crap thats been sucked in, then its a case of compressed air in a can and a fine strand of copper wire to ream the jetting out and the air to blow the jetting ports clean. then i would fill tank a bit and kick the bike without igniton , idea is to prime the carb up with fresh fuel and draw any crap in the pipe out, then drain the float bowl via the drain screw and only then reprime the scoot and go for a start and idle up running
