This demonstration guide answers one field question about a tube that leans only under load. Measurements come before parts, and the notes are not a generic equipment FAQ.
Diagnose before replacing parts
Start with load-run versus idle-run comparison. That reading separates a tube that leans only under load from adjacent faults that share the same complaint.
If the measurement is out of spec, treat the emulsion tube as the primary path. If it is in spec, do not replace the emulsion tube just to complete a parts list.
Repair the failed system
The usual correction is the emulsion tube, 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 tube that leans only under load.
Stop before you make it worse
Do not tightening the governor to hide a lean load. That shortcut hides the original measurement and creates a second failure.
If the machine still fails after the emulsion tube is corrected, convert the visit to a broader diagnosis rather than stacking parts.
Written and published by Ridgeline Small Engine.