I installed the KLX kit this week(along with a bunch of other stuff) and took a brief test ride before work yesterday.
Temps were about 50 deg F., Idle Mixture screw 2 turns out. KLX needle, Clip in 2 slot, stock Main Jet (145). It started right up with full choke(enrichener) and within 15 sec. Choke was off and it was idling fine at 1300rpm.
I had also just installed the Thermo-Bob2 so I shut it down after 1 min. and topped off the radiator. Started right back, and let it warm up testing out the thermo-bob and making sure the fan came on at about 210 deg..
Rolled out of the garage and took it for a short spin, no decel popping. Everything seems fine.
Before the KLX kit, I would have to ride for 1/2 hr with choke on about 1/2 way to keep it idling(idle mixture was at 1-3/4 turn). Now after a few minutes of warm up, if I try to apply choke, it stalls immediately.
I think I need to go back a little on the idle mixture screw and see if decel pop comes back. I also think the Thermo-bob has helped a bit, getting the engine up to operating temperature and maintaining it.
More testing today... I hope...