It is your throttle cable tightening. Did you make any mods lately (Jim's Spacers, new bars, etc.)?
The cables are not routed correctly (IMO) from the factory. They route from the carbs along the left side of the backbone, to the left side of the neck and then up to the control.
It is a relatively easy job to remove the tank, remove either side of the throttle cables and reroute then along the right side of the backbone, right side of the neck and up to the controls...
You will have plenty of cable then and it will never throttle up on full right lock again.
