need help..416 bore kit

[sick_ss/sc]

im new to this atv stuff..i just bought a 400ex ex...something aint right with the cylinder size and piston size..so i wanna get a new cylinder and piston kit..i found a good deal on a 416 bore kit...what size cylinder do i need for this to work??

[ish416]

A 416 uses a bored out stock cylinder.

[mineralgrey01gt]

stock bore is 85 mm, 416 is 87mm, i just dropped mine off this morning to be done