Had a partial throttle stuck crossing to Germany last year, the inner plastic of the throttle cable, the plastic sort of shroud, had a broken piece of about 1 cm and this slid around the cam on full throttle, effectively putting strain on the cable as if throttle partially open.

Was not until I closed the throttle that I noticed a perfect 85 mph on level road cruise control, soon hit the rev limiter if you pulled clutch in...lol

Took a few mins to find and sort at side of Autobahn !!

Reminds me ........Nelly new throttle cable !!