The last time I rode my '02 426 the throttle stuck open and I almost wadded up by missing a turn in the woods. As it was happening I tried to force it back down a couple times while in panic mode and it wouldn't budge until about the third attempt. Then it releases, goes back to normal and was fine the rest of the day. I figured if the cause was grit in the cable sheath then the problem would persist. Or, if it was a worn-out cable it would have broken. What else could cause a one time incident like that?