New developments, after a longer and carefull ride finally noticed something not right.
Engine idles fine, but with very small throttle openings when starting to move it will occasionally backfire into the intake. Once it stalled the engine though.
Interesting how different riding styles can mask symptoms.
Either air leak through intake boot of something wrong with the injector..
Growing old is mandatory... growing up is optional!
Raid de L'Amitiť 2011 RR (link