[bmartin]

I've read somewhere that honda (may be other mfgs also) installed some sort of damping rods in the handle bar to counter vibration. Makes sense to me - anyone got any info about this???

 

[HackAsaw]

some people have been known to simply pour lead in the ends of excessively light handlebars which find themselves easy prey for multiple harmonics

 

[2smokeTyler]

we were putting together an XR750 for steve murray and drilled the bars for the roll pin in the throttle housing, and the previous owner had filled them full of expanding foam...they oozed for 2 hours!! they make a "bar snake" that you put in your bars to dampen vibration. i'm not sure who makes them, but that is what they are called

 

[UngaWunga]

Lead shot and silicone caulking would do it.