1997 honda trx300ex

I’m new to all this lol! But do I need to rejet back to stock after getting rid of k & n air filter and going back to stock or aftermarket foam filter? Thanks! I also have a rebuilt 1997 Honda trx300ex

Bought a 97 trx300ex and rebuilt top end, ran fine; now it gives out when push throttle hard like it’s not getting gas or enough air. Carb has been cleaned/rebuilt, any help is appreciated. thanks in advanced!!!!