[vzaliva]

I think the problematic engines are big Harley twins which vibrate like hell and run relatively low revs. Superbikes engines are usually operate on high RPMs and vibrate less.

[dharmab]

Nope, happens with pretty much every bike. Have heard all sorts of riders talk about this.

[tomxor]

Quite possibly, in which case "No Harleys for you :D"