[hondajunkie]

hi im new to the sit. I was wondering if anyone had any info on the 440 big bore kit for the 400ex? i have some mods all ready i'v got white bros pipes, k&n intake
stage two jets stage two hot cam. i was wondering what else i mite need for the up grade, how dependable it is?

 

[Redracer]

They tend to run hot... The 426 kit is MUCH more reliable

 

[Helmut]

I don't have any experience with them, but I've heard the same thing that Red stated.

 

[rancher11]

Welcome to the forums!

 

[Helmut]

Welcome to the forums.

 

[mud99]

You will need to change the head bolts and get a set of harden head bolts. Welcome to the forums.