Hi,
This morning my ST220 started continuing to apply power when I lift off the accelerator (resulting in 6k rpm during gear changes). There is no slack in the accelerator cable and the cruise control cable isn't pulling on it.
I connected it to my computer and found that according to the TPS the throttle remains open after releasing the pedal, sometimes sticking at the previous point and sometimes dropping to 20% (closed is 15%). I've whipped the air filter housing off and can't see anything wrong with the throttle itself and it does appear to never fully close unless I force the bracket the cable attaches to back to the closed position.
It was fine the previous drive but yesterday I did remove the battery and air filter to do something else and might have disturbed the cable a bit but nothing major (I didn't lean on it or anything) :)
Obviously this all points squarely at the cable getting stuck in it's tube but is it usual for this sort of problem to come on this suddenly?
Cheers,
Peter.