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what size spark plug is in a 400cc Briggs and startton engine of a riding lawnmower?

The mower started, Stalled after about 30 feet and now turns over but wont 'catch'. I can't remove the spark plug to see if it needs a new one, don't know what size thingy to remove it with.What else could prevent it from starting?
Thanks for any help.

BS uses two sizes of spark plugs in their engines. The nut around the plug will use either a 5/8" or 13/16" spark plug socket to remove it.
If the spark plug uses a 5/8" plug socket, it is a RC14YC regular plug or RC12YC Platinum Plug. Both will fit and the regular plug is a lot cheaper than the Platinum. Newer engines use this plug.

If the spark plug uses a 13/16" plug socket, it is a CJ8, or RCJ8 regular plug, or J19LM Platinum Plug. Older engines use this plug.

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