Running badly at low rpm.

[blade023]

Hi all, wondering if anyone can shed some light on an issue i'm having. Last night on the way home from work the bike (gen1 fzs1000 ) started ok, but part way into the journey it started losing power at low revs and stuttering really badly like it was struggling. I've always been used to having plenty of power even as low as 2k but now anything below about 3-4k and it's stuttering quite badly. I'm going to check what I know how to, i.e; spark plugs, exup and airbox but if anyone has any input on what else to check I'd appreciate it. Will post an update with more info when I get a chance, but it looks like the 1 day off I have will be spent fettling.

Cheers.