This demonstration guide answers one field question about coil heat-soak or a shrinking fuel inlet. Measurements come before parts, and the notes are not a generic equipment FAQ.
Diagnose before replacing parts
Start with coil air-gap and hot-spark tested after a ten-minute run. That reading separates coil heat-soak or a shrinking fuel inlet from adjacent faults that share the same complaint.
If the measurement is out of spec, treat the ignition coil and fuel inlet screen as the primary path. If it is in spec, do not replace the ignition coil and fuel inlet screen just to complete a parts list.
Repair the failed system
The usual correction is the ignition coil and fuel inlet screen, installed to the documented spec for this complaint.
A demonstration shop records the finding so the next technician is not repeating a guess about coil heat-soak or a shrinking fuel inlet.
Stop before you make it worse
Do not replacing the carburetor before a hot-spark test. That shortcut hides the original measurement and creates a second failure.
If the machine still fails after the ignition coil and fuel inlet screen is corrected, convert the visit to a broader diagnosis rather than stacking parts.
Written and published by Ridgeline Small Engine.