About air induction, after having corcked it and disconnected the O2 sensor, following BDSB suggestions here http://bestdualsportbikes.com/dual-s...honda-crf250l/
and installed a dBkiller of my own, i had many stalling problems. That was cured by re-plugging the secondary air system and setting the first EJK parameter to 0, what got me rid of backfires too. Replugged also the O2 sensor, as i was there.
Doesn't seems logical, since i probably leaned at idle, but that's what experimentation concluded in my case.
Whatever .. i will try to experiment more with teh EJK setting (which you can emulate here http://www.electronicjetkit.com/demos/HPcurve.swf
press mode, then + or -)