home posts What should the gap be on a spark plug for a lawn mower?

What should the gap be on a spark plug for a lawn mower?

Dennis WaldenNov 21, 2021

Also, what should the spark plug gap be on a Briggs and Stratton?

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”

Consequently, do lawn mower spark plugs come pre gapped? Check the gap on the new spark plug before installing it. A new plug will often come pre-gapped to match your specific engine, but use a spark plug gauge to verify that it matches the manufacturer's specifications.

Keeping this in view, what happens if you put the wrong spark plug in your lawn mower?

Spark plugs that are gapped incorrectly can cause an engine to miss, or run erratically, especially during idle. The incorrect spark plug gaps can cause uneven firing of individual spark plugs and delay engine combustion; both of which can cause an engine to miss or idle erratically.

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.