socket size, remove spark plug

[zephead400ex]

what size socket do I use to remove the spark plug on my 400? thanks!

[zephead400ex]

I took off 4 disc, to give me 8 disc on my exhaust. I tried to start it after ward and it wouldnt start, put them back on, still wouldnt start, it is not flooded. I want to check the plug, but cant figure out what size socket to use.

peace

[MX250r]

21mm

[400ex45]

you have to get a special wrench because it the spark plug is deap in there and i couldnt find any socket that would fit in there.
and i was thinking it was a 18mm socket but i might be wrong.

[RIDER11X]

You will need the spark plug wrench that came with it or something similar, as most others are too thick walled to clear the sides along the plug.:(

[trailburner]

I use a 18mm deep well & a short extension,works for me;) ....

[02Yellow400]

Yeah i just use the one that came with my quad. I cant find anything else that works.

[400ex45]

i think i got mine from a dealer but it was for yamaha dirtbike but it still worked.

[Rip_Tear]

You can get them cheap from a chain saw place, thats where all mine come from. except the one on my MXZ!

[JOEX]

Originally posted by trailburner
I use a 18mm deep well & a short extension,works for me;) ....
Same here;) I don't understand why so many people have problems with removing the plug :confused:

Joe

[markvette]

you have to have a thin wall 18 mm deep well. a regular thickness socket will not work. we just had the same problem with the ex we just bought, nothing in my tool box would work then a buddy told me it had to be a thin wall socket. he was right