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The gap is .020 for most applications. If you get a new spark plug it will come pre-gapped.

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A: This spark plug should have a gap set to 0.02 inches.
Replacement Plug

The Craftsman 4.5hp mower uses either a Champion model RJ19LM or J19LM spark plug, or equivalent, with the gap set at . 030 inch.

The easiest way to check what kind of spark plug your mower needs is to check at your local hardware store. If you have the make and model the sales associates should be able to help you find the right plugs for your machine.
The optimum gap between 0.7 to 0.9 mm. At 0.4, 0.5, 0.6, and 1mm made more fuel consumption. Using platinum spark plug and RON 90 fuel can reduce fuel consumption to 5% on average.
Spark plug gaps for car engines are typically 0.6 to 1.8 mm (0.024 to 0.071 in). Modern engines (using solid-state ignition systems and electronic fuel injection) typically use larger gaps than older engines that use breaker point distributors and carburetors.
Engine Hesitation

An engine that hesitates, or stumbles, upon acceleration is often the result of incorrectly gapped spark plugs. If spark plugs are gapped too wide, the ignition spark loses some of its strength as it crosses the spark plug gaps.

One of the key factors that makes a spark plug work well, or not, is the size of the gap between the electrodes. If the gap is too small, the spark will likely be too weak and cause the engine to run poorly or with poor efficiency.
These plugs are pre-gapped at . 044″.
A spark plug gap is kept from– 0.3-0.7 mm because 0.3-0.7 is perfect gap for making spark in spark plug.
If the firing end of a spark plug is brown or light gray, the condition can be judged to be good and the spark plug is functioning optimally.
Lawn mower spark plugs are not universal in fit. They are specific to individual make and models.
Hard Start. The most common problem associated with a bad spark plug in a lawnmower is that the mower is more difficult than normal to start. A push mower may take several more pulls on the starter rope before its engine starts, and a lawn tractor fails to start with the turn of its key.
One of the key factors that makes a spark plug work well, or not, is the size of the gap between the electrodes. If the gap is too small, the spark will likely be too weak and cause the engine to run poorly or with poor efficiency.
These plugs are pre-gapped at . 044″.
Spark Plug Gap: 0.0275 – 0.0314” (0.7-0.8 mm) 5.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

What should the spark plug gap be on a weedeater trimmer 25cc
ANSWER : Set it at .025

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ANSWER : 20-25 thou which is around 0.6mm

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I need the spark plug gap for an Ariens ST624E. the spark plug = 21533500
ANSWER : The recommended setting is .030″

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ANSWER : .025″ plug gap

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Spark plug gap – Toro Lawnmower 20099 Mower Mowers Lawn
ANSWER : Hi campbell7505

.28—-.32

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Spark plug gap – Homelite Mighty Lite Blowervac
ANSWER : Usually about .020

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I need the spark plug gap for a MTD mower model # 11A038A729. It has a Briggs 12M902 0451 E1. Thanks.
ANSWER : The proper gap is ..030″ Here is the Briggs application chart for L-Head engines like yours.
http://www.manddsmallengine.com/briggs/info/plug7.html

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What is the spark plug gap for kohler series 2010 lawnboy mower 149cc ?
ANSWER : .025″ will do

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