Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Most standard or widely used spark plug size sockets are 5/8 and 13/16 I don't suggest that you use a 12 point socket, you should always use 6 point sockets, if you have the number on the spark plug you are trying to replace I should be able to pull that up for you. Spark plugs get get really tight over time due to the amount of heat that is created in that area, so having the correc size wrench is critical as you don't want to round off the corners on the spark plug.
Get me the number off the plug and if you have all the information on the engine I might be able to pull that up.
going to be one of these sizes, now if its in a OHC engine then it might require a specialized socket, notice they are all 6 point, click on the picture
Awesome, just get back if needed