Bike jerks when shifting to first and second gear?

Hi I’m a noob rider and I recently bought a 06 zx6r which is extended six inches and lowered, but I have been having trouble when it comes to upshifting. I don’t know if it’s just me or maybe it needs something repaired, but when I shift I preload the shifter let off the throttle then pull in the clutch and shift I... show more Hi I’m a noob rider and I recently bought a 06 zx6r which is extended six inches and lowered, but I have been having trouble when it comes to upshifting. I don’t know if it’s just me or maybe it needs something repaired, but when I shift I preload the shifter let off the throttle then pull in the clutch and shift I try to even make Sure I pull and let out the clutch and throttle all the way and it still seems to do it I’m kind of clueless any tips or thoughts? Thank you
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