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The generalized statements about the gaps being too small causing insufficient burn and too wide having a weak spark are spot on. As you widen the gap, you need to increase voltage to cover the gap. Also, as you increase pressure at the top of the compression cycle, you'll need to either increase the voltage output to the spark plug and/or reduce the gap of ...


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My RX7 was fouling plugs for a long time while we were getting the mixture settings right. Use a small bit of wire to pull any solids out of the gap, and spray the inside with carb cleaner. Wipe it down and let it dry off a bit. Then go and get a windproof lighter or a butane torch, and force the flame into the gap. There will probably be some sputtering ...


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Using carburetor cleaner should work just fine. I wouldn't use a wire brush or sand paper as these are abrasive. Depending on how much force you'd be using, you could actually damage the business end of the spark plug and limit its life expectancy. There used to be a spark plug cleaner which worked like a sand blaster, using compressed air and fine media to ...



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