Low revs stuttering

[nick crisp]

All very interesting - got a similar problem on my thou. Was much worse with open Viper can which was on the bike when I bought it. Changed to standard can, better but not right still. Have just put new Scorpion can on, as good as standard, but still not right. Problem seems to be at worst at about 3k rpm off throttle. Everywhere else, no problem. Can't work on my own bike due to shoulder problem which makes things very awkward, so sooner or later gonna have to take it in somewhere and lay out for someone else to take a look 
Pilot circuit problem?