Soon as you get the DLE engine if it does not have an ngk at least, you should throw the spark plug away or get rid of it and put either an NGK cm-6 plug on or an CM6 Iridium Plug.
The Iridium Plugs last longer and are less likely to fowl.
We at Razor Hobbies feel that the Iridium plugs are the best bet when it comes to choosing a spark plug for your engine.
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