my brother has a bombardier.
I have a z400.
he is good and i'm not
what do i need to buy

 

A chain! Hook one end to a tree and the other end to his quad and then yell "1, 2, GO"!

 

HAHAHA thats great! and probably the best way to win! lol

 

could start by removing airbox lid and rejetting it. makes a difference.
I started by doing that.
I am about at sea level and I put a 155 main jet in it.
I later bought a CT pipe, it came with a dynojet kit.
I installed it and now have a lot more mid range and top end power.
In the sand dunes by me it is usually a close race with a ds650.
Next mod will be cams.