ok so I have a OS.21 vzm in a thundercat 31 hull, has 440/3 octura prop, hpi header, cut mac exhaust 3.5cc muffeled, from nipple to exhaust header gasket is 10 inches. All the lines are in good condition, no leaks, or loose parts. carb needel is set at 1 3/4 turns out. Been threw 1 gallon of...