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Experienced gardeners share their insights in answering this question :
Spark plug gaps for lawnmowers and lawn tractors are not as critical as they are for motor vehicles. Generally, an acceptable spark gap is anywhere between .025″ and .035″.

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A: This spark plug should have a gap set to 0.02 inches.
A) For 28-32 cc engines, set the gap at 0.020″ (0.5 mm). B) For 38-55 cc engines, set the gap at 0.025″ (0.635 mm). IMPORTANT!: Always refer to the appropriate product Operator`s Manual for exact specifications and additional model specific service information when replacing spark plugs.
For these spark plugs, Toro recommends 0.28 of a gap in between the spark plug electrode and the top. Thread the spark plug in by hand. Use the ratchet to tighten it down until snug, then give it a quarter turn more to give it proper torque.
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.
The gap setting is different for each vehicle but most are somewhere between 0.028″ and . 060″. Consult the owner`s manual or Champion ® catalog to find the recommended setting for the vehicle you`re working on.
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.
Today`s spark plugs come pre-gapped, but it`s a good idea to double check this before installation. Use a gap tool and make sure the gap matches the specs for your machine. Screw the new spark plug in by hand for 4 to 5 turns.
The spark plug gap should be set to between 0.028 and 0.030 inches (0.70 to 0.80 mm.)
Spark plug tool size 21 mm which is the standard size for spark plugs and can therefore be used with all standard sized spark plugs.
Denso Set 4 Iridium Long Life Spark Plugs Gap 0.044 For 1.5 1.8 2.2 2.4 2.7 L4.
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.
A smaller gap will yield a short, intense spark and will usually make the engine real responsive. A wide gap creates a longer spark arc but without sufficient “juice” from your ignition system, (including amps), it can be weak and yellow in color.
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″.
Champion RJ19LM Spark Plug, 0.029 to 0.033 in Fill Gap, 0.551 in Thread, 0.813 in Hex, Copper.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

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

.28—-.32

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Will not start turns over has spark the engine was running and killed and will not restart
ANSWER : If you have good fuel to the plug and a good spark and it still does not start it could be a timing issue, check the flywheel key has not sheared.

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Spark plug it’s dry in not getting fuel to that
ANSWER : Clean your carb real good you will be amazed!!!!!!!!

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I have a toro weedeater. What is the spark plug gap?
ANSWER : .030 to .035

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What is the oil capacity for a toro 6.75 hand mower?What is the spark plug gap?
ANSWER : 20 oz of oilgap at 0.035

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What type of spark plug and the gap size – Tecumseh Lawn Boy Push Mowers Insight Silver Powered Series – Sens – A – Speed Walk Behind Mower – 10685
ANSWER : The Tecumseh Push mowers, most or all of the Tecumseh brands uses a Champion J8c, and the gap at .020.

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Mower runs till it gets hot and stops – Toro Power Lawn Mower
ANSWER : Could be the magneto, when it gets hot it will not prodce the spark to the plug.

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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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