first gear bog

i bought a used xr650L put on a high flow k@n filter removed the snorkel . before i did this i would get a small amount of bog as i first hit the gas in first gear now its worse. and my first gear wheelie fun is gone can anyone specifically tell me what i need to do to cure this problem? thankyou

has it been rejetted and the exhust been derestricted to match the high flow filter?

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