This demonstration guide answers one field question about a throttle that stays open if the cable sticks. Measurements come before parts, and the notes are not a generic equipment FAQ.
Diagnose before replacing parts
Start with spring presence and return force. That reading separates a throttle that stays open if the cable sticks from adjacent faults that share the same complaint.
If the measurement is out of spec, treat the return spring as the primary path. If it is in spec, do not replace the return spring just to complete a parts list.
Repair the failed system
The usual correction is the return spring, installed to the documented spec for this complaint.
A demonstration shop records the finding so the next technician is not repeating a guess about a throttle that stays open if the cable sticks.
Stop before you make it worse
Do not relying on the cable alone to close the throttle. That shortcut hides the original measurement and creates a second failure.
If the machine still fails after the return spring is corrected, convert the visit to a broader diagnosis rather than stacking parts.
Written and published by Ridgeline Small Engine.