Garden

The mower starts fine. The spark plug gets carbon on it within a few minutes and it runs rough. Air filter is clean. No adjustment on carburetor.
Experienced gardeners share their insights in answering this question :
Could be your choke is not shutting off like it should and some mowers the choke is on when you put the throttle wide open. Cut the speed back just a little and see if that helps.

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

Carbon fouling is an indication of a rich air-fuel mixture, weak ignition, or improper heat range (too cold). Carbon deposits are conductive and can create a path for spark plug misfire.
Rough starts, hesitation and poor acceleration are all common symptoms of a bad spark plug. If a spark plug or multiple spark plugs are faulty, they will have trouble creating the spark that causes the ignition process in your vehicle.
Carbon Buildup

Carbon collects on the plug electrodes because of incomplete combustion. The cause may be a simple one: You idle the machine more than you run it at full speed or the plug itself is designed to run at a cooler temperature than the engine needs for proper combustion.

Repeated overheating of the spark plug tip can cause the plug to prematurely fail. Overheating can be caused by many things like pre-ignition and a malfunctioning cooling system. Pre-ignition can lead to heat building up in the combustion chamber causing the spark plugs to fail.
Dirty or bad spark plugs won`t cleanly ignite the fuel causing the vehicle to misfire or sputter. You`ll either need to replace or have them cleaned. Because engine sputtering is a symptom of something more serious, it`s important to rely on an experienced mechanic to diagnose and repair the problem.
Spark Plugs

A rough idling engine can be caused by spark plugs or spark plug wires. Spark plugs use the electrical current received from ignition coils to ignite the air/fuel mixture within the combustion chamber. A plug that is damaged or installed incorrectly can result in fuel being burned at an inconsistent rate.

On stubborn deposits, use a putty knife, wire brush or steel wool, taking care not to bear down on the metal surfaces. Clean away the remaining carbon with solvent, using fine steel wool to smooth rough spots. You can also soak metal parts for up to 15 minutes to remove stubborn deposits.
Carbon deposits and buildup are a by-product of combustion in an engine that comes from incomplete fuel combustion. This black soot, similar to that which collects in a chimney, will harden on internal engine components such as injector nozzles, cylinder walls, intake valves, and more.
The carbon build-up problem occurs because of the high efficiency of the direct injection engine. High combustion pressure in a direct injection engine causes the build-up on intake values and other parts of the engine.

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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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Plug gapping geo tracker – Champion International Champion& Small Engine Spark Plug 8 Pack
ANSWER : Normally is .030″ however Due to the variety of engine and equipment configurations, your best source for spark plug information is your engine or equipment operator manual. download from www.fitness.manualsonline.com
God bless you

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2003 cavalier spark plug torque settings – Champion International Champion& Small Engine Spark Plug 8 Pack
ANSWER : Nobody torques spark plugs, just put anti-seize on the spark plug threads and hand tighten the spark plugs.

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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 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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