Spark plug gap for cohler courage 23hp - Craftsman 42 in. Deck 19.5hp Lawn Tractor

Question edited for clarity.
Question moved to model category.

It depends on the plug that you use. Some are Pre-Gapped.

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2004 KIA SPECTRA 1.8L L4 Spark Plug

RockAuto https://www.rockauto.com > catalog > kia,2004,spectra,1...
GM Original Equipment; Conventional; Pre-Set Gap: 0.041" ($0.50 Rebate Available!).

2004 KIA SPECTRA 2.0L L4 Spark Plug

RockAuto https://www.rockauto.com > catalog > kia,2004,spectra,2...
Original Center Electrode Material is Copper/Nickel; Do Not Gap, Gap is Preset. OE Fine Wire Platinum; Pre-Set Gap: 0.031". Alternate.

Assuming it’s a twin cylinder engine. Check your ignition coils. It sounds like one died and it’s only running on one cylinder. Using insulated tools(pliers) and gloves, while engine is running, pull one spark plug boot off of the spark plug, if it dies that was the good coil. If nothing changes then that’s the dead coil. Another sign of a bad coil is a strong fuel smell since it’s not getting burned.

Since you know the coils are good, there is only a few possibilities. The grounding wire must be causing a short to ground. Remove the ground wire from the coil. Check your spark plugs, are you swapping these too? The gap on the coil, this is a long shot, but if it is too far away, it will not fire. Are looking at the spark form the plugs? By firing you mean running, or spark. If you mean by running, check the compression. You may have a stuck valve, usually the exhaust.

have you tried a different spark plug? if not that then check the ignition coil supplying spark to the plug thats fouling

might have bad gas or dirty spark plug check the gap on your plug and maybe the coil

It sounds like when it warms up it dies. I would check the three basic things needed for any engine to run. Compression, spark and fuel. Compression and spark testers are available at any auto parts store and are fairly priced. I would check compression at start and check it right after it dies. Do the same with spark. Also check or replace the fuel filter to make sure there are no obstructions. This should give you a good starting point. Compression on a unit like this should have at least 75 psi, and spark should jump the gap on spark tester. Message me back after doing this and I can help you further.

I’m happy to assist further over the phone at https://www.6ya.com/expert/layne_0fccff498c319c32

I WOULD RECOMMEND CHECKING AND INCREASING THE FLOAT LEVEL OR MAYBE THE FLOAT SEAT HAS DIRT IN IT.

A coil is simple gap it from the flywheel about the thickness of a business card--attach the ground wire and plug the spark plug in.

Tada!

If yours looks more difficult send me a model of your engine and I will give more detail.
joe

check and see if it's getting spark by removing the plug from the engine and keeping it plugged into the wire,lay the plug on the head and turn the engine over and look to see if the spark is jumping accross the gap. if it's blue your ok if it yellow you'll have to replace ignition modual..good luck