sxf 250 jetting

Hi everyone

i have an sxf 250 2007 model and when i up the throttle instantly i.e ticking over straight to redline it hesitates then picks straght up, what would be better for me to buy a jd jetting kit or an fmf ? it has a standard exhaust right now and just fitted a new vertex standard piston

all recomendations ans advice would be great

regards Alex

also i have heard somthing about a fuel pump jet or somthing like that that will make it run better ?

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