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View Full Version : socket size, remove spark plug


zephead400ex
05-14-2003, 08:37 AM
What size socket do I use to remove the spark plug on my 400ex?

peace
zephead400ex
05-14-2003, 08:45 AM
I do not have my plug remover with me, help me out guys! I need to get this done...:D
MX250r
05-14-2003, 10:07 AM
I'm pretty sure it is a 21mm.
sprtrx300ex
05-14-2003, 10:14 AM
18mm
400exdad
05-14-2003, 10:20 AM
I think you're going to have to have the factory spark plug tool because of the head design around the plug. Just last week, I thought for sure a socket would fit when the tank and heat shield were out of the way.... I was wrong.
norrisboat
05-14-2003, 10:29 AM
try a 4mm. it will fit, trust me.
300exTJjeeper
05-14-2003, 11:08 AM
Originally posted by norrisboat
try a 4mm. it will fit, trust me.

I agree
ledofthezep
05-14-2003, 04:36 PM
He got it,....turns out his old man had a socket out of his good 'ol Bayou220 that worked! :D
05-15-2003, 03:53 PM
i used a THIN walled 18mm and it worked after i ran around town lookin for one the whole night.
UglyMotha™
05-16-2003, 01:26 AM
Originally posted by norrisboat
try a 4mm. it will fit, trust me.


:huh do you realize how small that is
heavy_d
05-16-2003, 01:48 AM
13/16 works with my NGK BR8EG
jgbailey57
05-16-2003, 09:14 AM
I wanted to post this question a few weeks ago but figured you guys would make fun of me. Turns out the spark plug was loose and I took it out by hand. It's an 18mm, but it's a tight fit for the socket to fit in there.
CEG300EX
05-16-2003, 01:25 PM
Just go somewhere &get a cheap 6-point 18mm socket & grind it down. Problem solved.
Make sure it's a 6-point