spark plugg coming loose

["BLAHH"300!!]

everytime i ride here latley i've noticed after words that my plug has worked it's way loose- what is this all about- it was in there good to start with- why's it coming loose now-
it's the right size and everything-
has anyone else noticed that the hole to tighten the plug is just way to small- you can't fit a needle in there- much less a socket

[400exRacerX]

What i do is tighten it until it stops, then snug it a 1/2 turn and you will be fine. As for you not being able to fit a tool in there, that is the reason why your quad came with a spark plug tool!;)

[Mity Mo]

Another way is to buy the Motion Pro tool designed for the XR400. It works awesome. It is a socket that works for the plug. I think I paid around 15 bucks for it and it is the best money i spent for a tool.:D

[Braff1]

Ex-citing,
I have been having the same prob on my 2001 300 EX. I have tried changing from the NGK brand to Champion. No matter what plug I put in it would loosen up. Yes I snugged it in there. I noticed it started while riding up at Mountain Parkway, noted for there large hills, I initally thought it was something internal with the quad. When I went to check the plug it was finger tight. Tightened it up and it ran like a champ. Now I just keep a close eye on it until I can figure out why this happens.

Dan

[barbwire44]

It sounds to me like you guys at one tme or another have overtightened you're plug and screwed the threads up. I would suggest pulling the head off and having a look if so get out the heli coils or bore and tap it and buy an adapter to put on youre plug most machine shops can do it pretty easily.

["BLAHH"300!!]

thats too much trouble man-

i'll just bring gloves and a sockett and hit it when it comes loose
i'ts not that big of a problem- i know when it comes loose couse it'll act like the rev. limiter is kicking in-