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My plugs all read perfect. My mpg is excellent. There is no hesitation or performance issue. However, i still have sputtering out the left side exhaust. Would poorly seating aftermarket float needle/seat cause enough unburned fuel to mildly backfire, without fouling the plugs? Or perhaps too high a float level? I had already swapped out the aftermarket for my old stock float valve assembly in one carb, and bent the float tang down, which all corrected a flooding cylinder #1 and foued plug. My only other thought is that the battery may be weak, though it has good charging/static voltage(s). And yes, new air-cut valve. The carbs are immaculate. New points, new plugs/caps. Timing is spot on. So are valve clearances. The sputtering is on accel and decel.
 

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I can't see a weak battery having a bearing on this, once the engine is running anyway. Did you measure the float heights after bending the tabs?
 

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Yes, i did measure the float height meticulously after adjusting. Though i only replaced/adjusted the one float.
 

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I suspect this is from poorly seating aftermarket float valve/needles. Is there any harm to slight backfire/sputter/flooding, if plugs are ok, and no smoke? I'm going on a long trip Thursday, and would rather not pull the carbs again.
 
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