well 2 days ago i was riding and i got to the top of a steep hill an noticed the bowl was over flowing so i tore it apart and fixed the float. i managed to foul the plug so i put a new one in and the motor now has 10 hours on it. after all my heat cycles after break-in it ran great now it bogs when you stab it to full throttle and the plugs come out looking black. should i step down a few sizes in mains? also i noticed my base gaskests are leaky would that be another reason?