Ninja Boy is at 1250 revs. As I broke it in the rpm's at idle went up as the engine loosened up. After its first long freeway ride (extended time over 9k revs) the idle went up and I had to turn it down a bit. It has been stable since.
Things to look for if your idle suddenly increases:
Make sure throttle cable is not sticking/adjusted too tight.
Make sure the throttle return cable (if present) is NOT slack.
Make sure throttler tube/grip is not sticking or binding on the bar end or handlebar/clip-on.
Check for air leaks between the carbs and engine.
And keep in mind that bikes with carbs are in general temperamental.
Check for sticking floats in one or both of the carbs, or float level set too high.
I have come to terms with the possibility of dying while riding, life has a 100% death rate. I would rather live having fun and end up dead in a motorcycle crash than never do anything fun because it's dangerous and I might get killed. No one makes it out alive anyway. - From a friend on another forum, used with his permission.