i Have a 2009 WR450. I have 50 miles on it and i live in Colorado. I removed the AIS and did not rejet, i removed the inner part of the silencer, i disconnected the gray wire, i changed the throttle stop screw. My bike runs really good and feels strong even without rejetting the carb. I want to ride a couple of more times and then get a silencer. It's too quiet. When i change the silencer do i need too rejet to make it richer. I bought the GYTR AIS removal kit but didn't change the jet's. The kit came with 175, 110, and 50 jets, and an adjustable needle. Are these jet's the right choice for where i live (6,000 to 9,000 feet)?