HELP : leaking carby

i recently had a new diaphram put in my 99 wr400 carb a few days later i noticed fuel was constantly draining out the overflow (Over a few days it would drain the tank).When i snap on the power the bike wants to die so i have to back off & slowly dial it on to get the power out.The bike won't even idle i have to keep the revs up so she doesn't die.could someone please give me an idea to resolve this situation as the bloke who fitted the diaphram no longer works at the bikeshop & they are not willing to help.

check your float and float valve.

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