How do i get better throttle response for my yamaha blaster

all depends on the carb setup.remove front pipes and check for restrictors..if its weled just inside the manifold,weld on the outside and gringd off the weld on the inside..that is a trick that will speed any bike.change rear box as that is also restricted.

jet it better, stock jetting almost always leaves room for improvement, especially on 2 strokes.