What size scoket is a 400 ex Spark plug

[ride_red_5400ex]

What size scoket is a 400 ex Spark plug and how do i take it out

[BIGRED400]

Up front in the middle of the head............LEFTY LOOSEY, RIGHTY TIGHTY:p

[lil400exman]

Originally posted by ride_red_5400ex
What size scoket is a 400 ex Spark plug and how do i take it out
if you dont know that you shouldnt own anything with an engine:huh

[250EXstud]

most of my sockets don't fit down into that hole so the 400 spark plug wrench is really helpful.

[400EXrider77]

you have to get the honda one

[BSTURDIVANT]

It's 18mm -we cut the outside down on a craftsman deep socket for ones that are really tight!

[dasheek]

i lost my wrench so i took an old 18mm deep weel and took it to the bench grinder untill i got her down enough to fit. Kind of a sketchy idea but hey who cares it works.

[02Yellow400]

you can buy an 18mm thinwall deep socket

[brandonpeake]

the old 300 fourtrax sparkplug wrenchs will work on the 400ex also and are alot better than the 400ex sockets from honda