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Spark Plug Gap

Good engine performance requires the proper spark plug gap. You can measure and set the gap in minutes to fit the specifications of your engine.

By the DIY experts of The Family Handyman Magazine

How to gap new spark plugs

Spark plugs don't come gapped for your particular engine. For the best performance, you must gap the plug to the engine manufacturer's specs. If you're buying a plug for a small engine, ask the parts store to look up the gap size info for you. If the plugs are for your vehicle, find the info in the owner's manual. Then adjust the gap as shown.

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Required Tools for this Project

Have the necessary tools for this DIY project lined up before you start—you’ll save time and frustration.

You'll need a spark plug socket and a gap gauge.

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