You best look at the engine first. The plug is located under the black rubber hood attached to a black rubber wire going into the bottom of the cover over the engine fan.
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On my old riding mower (Craftsman), I found it on the very front of the engine exactly opposite of the rider. Two big screws, one on each side, allows the whole cowling to come off. Once the cowling is gone, it is very obvious.
The spark plug gap for a Murray 12 hp riding lawn mower should be set at .020 inches. This is equal to .5 mm.
.20
To locate the spark plug on a Yardman riding lawn mower, first, ensure the engine is cool and the ignition is off. Generally, the spark plug is found on the side of the engine, attached to a wire harness. You may need to remove a protective cover or engine shroud to access it, depending on the model. Once visible, the spark plug will be a cylindrical component, typically with a rubber boot connected to it.
RC12YC Champion
take the spark wire off, remove spark plug, put wire back on plug, put steel part of plug against the medal part of engine (with a insulated pare of pliers) then crank the motor over watch the electrode on end of plug if you see spark you have it if you don't ....
Should be 5/8
I am assuming that the mower doesn't start.... My first guess would be that you are not getting spark to ignite the gas in the engine. Check to see if you have spark at the spark plug.
To fix a flooded riding mower, start by turning off the ignition and removing the spark plug. Crank the engine a few times to expel excess fuel from the cylinder. Once the area is cleared, dry the spark plug or replace it if necessary, then reinsert it. Finally, attempt to restart the mower while giving it some throttle to help clear any remaining fuel.
To put a new keyway on a riding mower, first, ensure the mower is turned off and the spark plug is disconnected for safety. Remove the drive pulley or the part that houses the old keyway, and clean the area thoroughly. Insert the new keyway into the slot on the shaft, align it properly, and reassemble the components, making sure everything is secured. Finally, reconnect the spark plug and test the mower to ensure it operates smoothly.
how to replace plug wire on a toro mower
what is the spark plug setting for 7hp self prepelled troy bilt mower
remove the old spark plug and either take it into your local garage and the guy behind the desk will find you the replacement, or right down the type of spark plug (found on the side of the plug) and go to the NGK website and you will find the replacement on there, The above advice is if you have the previous spark plug, should you not, your best bet would be to go to the manufactures website for the engine and look up for engine failing that take the mower to your local garden equipment service engineer (yellow pages) and they will find you the correct spark plug.