WHAT do i need to do to my warrior to make it keep up with the likes of a banshee (-:"

 

There's several ways to go about this.
1. Stroke kit from alba
2. Sleeve kit from several companies (dirtwheels mag has them advertised)
3. Buy a banshee (LOL)
It all depends on how much money you have to spend
and what type of riding you do.
I just went the cheap route and purchased a high compresion piston, + cam and valve springs, + a little porting. I'll let you know in a couple of weeks when I have it completed. I ride with my buddy who has a 400ex I'll let you know.
I'm sure it wont beat it but I know at least I wont have to work as hard to keep up.

 

you could trade up to a Raptor! otherwise, it'll require a bore/stroke job to do the trick. Look to spend at least a grand doing it.

 

A stroke kit from Alba is 2 to 3 grand.
A little pricy.

 

Buy a Banshee