Ok, messin` around with my 03 400ex my wife just got for my birthday...I have replaced an a-arm, put on different shocks and handlebars, different steering stem on the way but, I cannot get a socket on my sparkplug... even went and bought a 18mm deep socket....sparkplug socket and 18mm seem to be to thick to get down in head...... what`s the trick????..

 

a few options:

buy the tool that comes in the kit from the factory
by a thin walled deep well ( i have talked to people who have a thin walled deep well craftsman that does fit)
grind down the sides of your deep well so it fits

 

figured on the tool from the kit....just started watching e-bay for that...hope I`ll go by a Sears soon.....Thanks !!!

 

THE RIGHT SIZE SOCKET SHOULD BE A 5/16 DEEP SOCKET

 

18mm is the stock size. metric is used, not stardard.

 

had the new spark plug from dealer in hand while looking at sockets....

 

Hondaguy, 5/16 is only 1/14 over a quarter inch, that's one small plug you got there !!!!! [img]i/expressions/face-icon-small-tongue.gif[/img] [img]i/expressions/face-icon-small-tongue.gif[/img]

 

Does 1/4 plus 1/14 equal 5/16? (Just giving you crap )
5/16 is .3125"
18 mm is .7086"
Should be able to get a replacement plug socket from the dealer.