What size wrench for 400ex spark plug?

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01-26-2002, 05:14 PM

JustofPRD

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I need to check my spark plug to see if that is the problem with why it is not starting but i dont know if it takes a 5/8 or 13/16 wrench. Is it easy enough to take off the plug with out removing the gas take.

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01-26-2002, 07:31 PM

Mr350X

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Its a Honda... (not american) it takes an extremely thin wall 18mm socket.
(I had to carefully take my normal thin wall to my grinder to make it thinER-wall)

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01-26-2002, 09:01 PM

MichaelAZ

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What about your tool kit in the bike ?? Yeah its not a snapon or mac tool but what the hell, how often do u need to use it ? Thats what I use.

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01-26-2002, 10:28 PM

Quadfather

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I had a heck of a time getting the one in the toolkit to work. It seems too thick. I ground down the square edges of it tonite, and will see if it fits any better tomorrow.

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