spark plug wrench

[dirtdawg]

what size is the plug? 18, 3/16 or 3/4? the 400ex is 18mm so is it 18? it is a very tight spot too. i'll probably need a thin-wall socket or a small wrench. please let me know. gonna order one tonight.

[bwamos]

Same as the 400ex.

You can get the thin sheetmetal style sockets similar to the one that comes with the 300ex at Lowes/Home Depot in the Lawn and Garden department (for riding mowers).