i bought my 400 used so no tool kit , i have a friend with an 03 and who rounded out the honda socket trying to get it to work and have been told to get a socket for a fourtrax 300 and its better and the same size, but i bought one from pro design and its too long to get on the plug without taking off the white plate under the gad tank and everything on top of it , so i can t imagine u should hage to go thru that everytime u change a plug ,so is the stock 400 socket ok and that guy was just a D.A
or what
thanks