+1 on the carb boot leak.. Are you sure it didn't blew off the carb (or tore the boot)?
IMO pull & reinstall the carbs (check for cracks on the boot during this, also you should check the front carb at least - as some serious backfire could cause the slide/diaphragm to melt, and as written before it's easy to clog the idle circuit as well), and if it's still producing the problem only then check the timing.
Also you should check the vacuum ports on the manifold if they are still in place / not leaking.
If the timing chain jumped (which IMO is quite rare to happen), then - because of the cams are gear driven - both intake and exhaust cams will be off, and you will probably need a degree wheel to readjust it properly.. Should this be the case, play attention to get it right (infos about firing order and proper crank degrees are on ktm950.info) - don't configure it for a bigbang setup:)
2005.5 950 Adventure (with 265mm travel suspension
Sumi screwed with this post 10-01-2013 at 08:13 PM