i have a 07 450r with a white bros mx4-slip on uni filter and a raven acc. pump cover.anyone know what jets i should use??

 

Don't have a clue on the jetting but white bros. should have a phone # for some type of techline
I would hope but not sure what that is.
Might could find it in dirtwheels,etc...

 

try the dyno jet kit stage 1&2

 

Whenever jetting, I would always start with the exhaust manufacterer. All the popular ones have a tech that can give you some good advice where to begin. Also, buy a jet kit from a reputable maker like Dynojet. There are so many variables with the mods you have, elevation, etc. It really is a tough question to answer unless you find someone with an identical quad with identical mods and living at the same elevation....One thing I do like to tell everyone is to make one change at a time when jetting and write everything down! Otherwise, you will either get lucky or lost!