I think I have my jetting close my plug is looking good tanish brown after each ride, the problem is, when I come into the mid range and try to rev through the high end my bike starts breaking up and studering. is this a jetting problem or is my ignition taking a $h1t? also when I rev 5th and 6th gear out and let off it bogs when I get back into the gas, I have to dwn shift and rev the crap out of it to get back into the power band, will bigger carbs fix this ??