Mate of mine managed to over rev ("only for a second or 2") his 650 bandit last night on the way home, and now has a "very eractic and not at all constant" mis-fire above 3000 RPM.
Also engine is very down on power.
I've suggested he starts with compression tests, but would anyone else like to have a guess at the problem, and offer suggestions to help diagnosis?
Many thanks.
David