Twin Air cage and filter on 05 CRF 450.. jetting

[426 Pilot]

I have a 05 CRF 450 with the twin air system installed. My question is: Does this modification typically call for jetting changes? I am in So. Cal (sea level, 70-80 degrees). I also have the T-4 slip on. The bike seems to be touchy off the bottom and want's to die if I wick the throttle to quickly. It also has a tendency to pop on deceleration pretty bad. I actually had a pretty good crash at elsinore 2 weeks ago when I hit a small 2nd gear jump out of a corner and the bike just died in mid air when I blipped the throttle.. I have all stock jetting right now.

Any advise?

 

[biglou]

Lots of popping = too lean. A little popping = optimal (I'm told). Try the fuel screw first, if you have to go beyond 2.5 turns out, go back to 1.0 out and bump the pilot up one, etc.