This demonstration guide answers one field question about passages blocked behind welch plugs. Measurements come before parts, and the notes are not a generic equipment FAQ.
Diagnose before replacing parts
Start with passage airflow after plug removal. That reading separates passages blocked behind welch plugs from adjacent faults that share the same complaint.
If the measurement is out of spec, treat the welch plugs and kit gaskets as the primary path. If it is in spec, do not replace the welch plugs and kit gaskets just to complete a parts list.
Repair the failed system
The usual correction is the welch plugs and kit gaskets, installed to the documented spec for this complaint.
A demonstration shop records the finding so the next technician is not repeating a guess about passages blocked behind welch plugs.
Stop before you make it worse
Do not spraying cleaner and calling the rebuild finished. That shortcut hides the original measurement and creates a second failure.
If the machine still fails after the welch plugs and kit gaskets is corrected, convert the visit to a broader diagnosis rather than stacking parts.
Written and published by Ridgeline Small Engine.