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A spark plug fires the fuel in engine to make run.

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You can find this parameter in the user and maintenance manual for your garden tool: for Efco machines, the standard spark plug electrode gap is 0.5 mm for chainsaws, brushcutters and blowers, and 0.7–0.8 mm for tools such as lawnmowers.
Most of our handheld engine spark plugs should be gapped at either: 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).
Your spark plugs are what supply the spark that ignites the air/fuel mixture, creating the explosion which makes your engine produce power. These small but simple plugs create an arc of electricity across two leads which are not touching, but close enough together that electricity can jump the gap between them.
The distance between the tip of the spark plug and the central electrode is called the “spark plug gap” and is a key factor in the function of a spark plug. Spark plug gaps for car engines are typically 0.6 to 1.8 mm (0.024 to 0.071 in).
What are the conventional spark plug gap settings? The conventional gap settings are as follows: Racing Plugs 0.016″ 0.4mm. Coil (Standard) 0.025″ 0.6mm.
Spark plug sockets are—you guessed it—sockets designed specifically to handle spark plugs. They come in sizes that fit snugly around most spark plugs, and good ones have magnets and a bit of rubber inside to keep them from falling out when you`re removing or installing plugs.
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.
Setting Gauge 0.35mm for Setting Ignition Coil Gap. Genuine Stihl Part.
SPARK PLUG GAP: 0.51mm (0.020 in.)
Clean the spark plug. Check that the electrode gap is 0.020 inch (0.5 mm). The bar should be turned daily for more even wear.

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

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What is the spark plug gap for a NGK BPM8Y – Echo Cs-400 Chainsaws
ANSWER : 20-25 thou which is around 0.6mm

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<!– from fixya rte –>Spark plug gap setting poulan pro 033. – Poulan Pro Prod/Poulan Weedeater Poulan Pro PP5020AV 20" Gas Chain Saw
ANSWER : .025″ plug gap

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Spark plug gap on husky 350 chainsaw
ANSWER : The plug should gap at 0.5 mm or .020″ and be sure to use the proper resister plug. Do not cross reference a plug.

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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 a ryobi string trimmer model # ry30550 ?
ANSWER : I can’t say for sure, but it’s PROBABLY about 0.035″.

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I need a spark plug gap
ANSWER : 0.5mm or .02″

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