just brought 02 yz 426 as a not running bike

First thing I do is pull the carby off and there is a vacuum hose going from the air filter to near the bore,right through the carby, why would any1 do this and second thing I check is a jet that leads from the pump to the air filter side of the main bore is extremely blocked with what looks like glue, any ideas on what someone was trying to achieve?

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