jetting or, air box mod?

[T-were]

twin air fliter, dr.d slip on, and moose racing stage2 jet kit (needle on groove #3, and main jet is 170,) fuel mixture screw is at 3.5 truns out. with air box lid on, bogs down about midrange, with lid off runs like a rapped ape, but i want to keep my air box on cause i ride in some mud on woods trails now and then, should i just drill some holes and get some of them little round pre filter filters, ?

[2004exrider]

your deff. to rich, so yeah if you want to you can put the prefilters in or just rejet.

Jimmy

[Mobile Dyno]

I would put a 160 main in if your running with the lid on maybe even a 155. Try that and let us know how it is