This is my first post as I have been reading old posts like crazy first to see if I can find something related to my problem.
My bike is a 2005 that was a standard UK model with 8000km.
I took the bike to my usual mechanic for a good full service. He removed the AIS and fitted the performance jetting. The idle jet is a 48. The bike pulls cleanly and goes very well. When it starts it idles fine, but as soon as the motor is warm it wants to die while making a very sick backfire like it is sucking air somewhere. A sort of whistling noise before the pop. The carb has been out numerous times and no leaks were found there or where the AIS was connected.
The battery is old and needs a charge after each test, but builds enough charge during a ride to use the e-start a couple of times.
Are there any other points to check and could the battery cause a bad idle somehow. Valve clearances have been triple checked.