250X Jetting Help

[Quadracer5]

Hey guys, I need some help with my jetting. I have an '87 250X, wiseco 12.1 high compresion pistion .020 over, Pro-Circuit T-4 silencer w/ stock headpipe, stock air filter. I have popping at decelaration (sp?), bike seems to run ok otherwise. Some popping at idle or take off when cold. Anyways, for you jetting guru's out there, where should I be with the main, needle and pilot? Thanks in advance.

Kyle