so whats happeing is that if you set the speedo up,your hitting full throttle before the stick reaches its full travel yes?
im guessing that the pot inside the radio has worked loose and its twisted round a few degrees so the pot is reaching its end point before the stick is..you can open the radio up and check the screw that locks the pot onto the stick movement is tight,if it has moved then its just a case of twisting it back round 1-2 degrees,connect your speedo up without motor and push stick fully forward,keep the stick jammed forward while you turn the loosened pot in its housing,watch for the high throttle light on the speedo and set it so it comes on at the right point.
dave
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