who makes the 406 kit??

[yellow400ex05]

I'm just wondering what company makes the 406 bore kit for the 400ex?

[GPracer2500]

JE, Wiseco, and Ross all make an 86mm piston.

[400sEXridr]

i dont know of anybody who makes a 406 KIT. Everybody I talked to bought an 86 mm piston and had the sleeve bored at a local machine shop. Thats the way i did it. I havent seen any kits that come with a prebored sleeve

[cals400ex]

heck it would be easier to get your stock sleeve bored out than getting a new sleeve put in. just get your sleeve bored and get the 406 piston. i would bet CP makes on too but i am not 100% sure.