Hi,

I rode my friends 2010 Ninja 650 yesterday as he said it had a problem. In all gears it is stuttering at all different RPM levels so I am actually shaking forwards and backwards on the bike despite holding the throttle constant. Any ideas what this can be? He has 24000 km on and rides in all sorts of weather. The symptom is almost like I just keep twitching the throttle on and off really fast to create the stuttering feeling. Hope I am descriptive enough. Any idea are appreciated.

Thanks!