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spark plug problems
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Posted by: blackwell17

hey guys...i have a 00' 400ex and cant get the spark plug out for the life of me. I tryed a 18mm socket deep socket and it was not even close to fitting in there. So i grinded it down a bunch and it is still wayyyy too big. Is there a special tool I can use?

Posted by: 03pissedoff426

your quad came with a tool in the tool kit to take out the plug. they are cheap and thin. i use one from " a old honda 3 wheeler " it is thicker and doesn't bend or anything. i would say check on ebay for and older style tool kit or just a new one. i believe motion pro makes a special tool also. check out rockymountainatv.com see if you can find what your looking for

Posted by: sickmojave

craftsman makes a deepwell thin walled 18mm socket that will fit..

Posted by: daredevilearth

I just used my roommates spark plug toll from his 2004 660r Raptor. Dont know why they make the one that comes in the 400ex tool kit so long.

Posted by: JOEX

There seems to be some variances in the fitment of Craftsman sockets on the 400ex spark plug. I use a regular 18mm Craftsman deepwell socket that I bought in a 200 pc. kit around 1986 or 1987. It fits my 2001 400ex with no problem.

From what i've read the stock tool kit plug socket works great.

Posted by: blackwell17

i called the honda dealer and ordered one...but what I did was take a plumbers socket type thing that was too small to fit the plug, and grinded it out to make the walls really thin but big enough to fit the spark plug. Worked perfect and I got the spark plug out!!! Too late tonight to try and start it up..but wish me luck!!

Posted by: blackwell17

UPDATE

well I fouled yet another plug so somethings wrong w/ the jetting or something. I cross referenced the NGK plug and tryed out a different brand. With this new brand, I can actually stick a normal spark plug socket in there easily and it fits the head of the spark plug like a glove!!! Changing spark plugs is SOOOO much easier now!!

Posted by: 400EXtreme

Do you ride through alot of water?

Posted by: blackwell17

nope...that wasnt the case for the plugs

i rode through the water a lot the other day and didnt foul a plug yet