spluttering

Hey all, After a bit of advice! Was on track last night at my local circuit (Cadwell Park), bike running great! On the 4th and last session of the evening I was WOT on the main straight and the bike suddenly started spluttering and felt like it had lost most of its power. Thought I had...

I've currently got an engine warning light and the bike isn't running as it should, spluttering badly once under load. It otherwise runs fine. The error light goes out on turning the bike off and comes on again when coming on load, if I dont ask for power then it seems to stay off for a while...