I need help i got a 99 400ex and im gettin a 440bigbore kit but i wanna get the best one so i need help whats the best 400ex bigbore kit

 

Go to Powroll.com. They have to basic types of 440's. One is bigbore, the other is stoker/smaller big bore.

I have the stroker. It is the 87mm big bore which is 416 and then stroked to 440. It is alot of money but, way worth it. I ruin grips in just a few rides, it pulls that hard. I have ran it about 2 years now, and just pulled the engine to loan to a guy to race. His blew up, up so borrow the stroker. I told my engine guy. "since its out lift the head and see how it is". If it needs it I'll go to 88mm which would be 450cc. If not I'll put it back in.