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...

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Sold all the quads but can't stay away.Hope to be building a polaris soon.

try the dyno jet kit stage 1&2

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Raptor 350_Hmf slip-on_DynoJet_powermadd hangaurds
z250(brothers)_whitebrothers bumper_pro taper handlebars_razors
Arctic Cat 400(dads)_itp mudlites_K&N air filter

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!

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I don't think the mud is that deep....!!!

2007 Sportsman 800 EFI Deluxe
ITP SS108's, 26" Mud Lites, 2.5 Warn, Synthetic Rope, bumpers, Dalton Clutch, K&N

2008 Sportsman 700 EFI X2 - The Wife's
800 rims, 27" Mud Lites, 1.5" spacers, 2.5 Warn, Synthetic Rope, Dalton Clutch, K&N filter, brush guard

2007 Troy Lee Predator 500
HMF Sport exhaust, UM Racing air box, K&N filter, Jet Kit, UM bumpers, UM nerf bars, etc...etc...