home posts What should the spark plug gap be on a Briggs and Stratton?

What should the spark plug gap be on a Briggs and Stratton?

Dennis WaldenSep 13, 2021

Flathead Engine Spark Plugs & Gaps

Replacement Part Type	Briggs & Stratton Spark Plug Part Number	Spark Plug Gap
Electromagnetic Suppression (EMS) (Replaces Champion QC12YC)	691043 792015	.030”
Extended Life Series® OHV Spark Plug Platinum (Replaces Champion RC12YC)	696202 5066 (5066D, 5066H)	.030”

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Consequently, what is the correct spark plug gap?

For most racing applications, you usually want the plug gap to be between 0.020 and 0.040 of an inch. Most engine builders seem to settle around 0.035 of an inch. Factors such as the type of ignition you run, cylinder heads, fuel and even timing can affect how much gap will work best for you.

Likewise, what happens when the spark plug gap is too big? One of the key factors that makes a spark plug work well, or not, is the size of the gap between the electrodes. ... However, if the spark plug gap is too large, the spark is unlikely to consistently "jump" across the long distance between electrodes, thus leading to a rough-running engine or one that doesn't run at all.

Simply so, what is the difference between RC12YC and rc14yc spark plug?

What is the difference between rc12yc and rc14yc spark plug? The higher number is a slightly hotter spark type plug. The RC14YC4 is now the standard plug for the 990/992 Generac engines. The 999 in the new 16-22kW Evolution (7000 series) units and older 20kW units are still using the cooler RC12YC4 plugs.

What happens if spark plug gap is wrong?

Incorrectly gapped spark plugs could cause engine misfires. Corroded spark plugs could halt the spark altogether and, again, cause misfires. Broken spark plugs could, you guessed it, cause misfires AND if pieces of the ceramic enter the cylinder, could cause far worse issues down the road.

What happens if point gap is too small?

In short, either too wide or narrow a point gap will cause a misfire under load. I recommend setting your point gap with a feeler gauge and fine tuning with a dwell meter.

Is a wider spark plug gap better?

The larger the gap, the more voltage is needed to jump the gap. Most experienced tuners know that increasing the gap size increases the spark area exposed to the air-fuel mixture, which maximizes burn efficiency.

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About The Author

Dennis Walden

Dennis owns a small farm and loves to grill since his early childhood. He’s a professional cook, but hiking and enjoying the great outdoors is his no less favorite part of life.