This demonstration guide answers one field question about a primer path that bypasses the main jet. Measurements come before parts, and the notes are not a generic equipment FAQ.
Diagnose before replacing parts
Start with fuel appearance at the venturi during prime. That reading separates a primer path that bypasses the main jet from adjacent faults that share the same complaint.
If the measurement is out of spec, treat the primer passage as the primary path. If it is in spec, do not replace the primer passage just to complete a parts list.
Repair the failed system
The usual correction is the primer passage, 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 primer path that bypasses the main jet.
Stop before you make it worse
Do not choking a primer engine until it floods. That shortcut hides the original measurement and creates a second failure.
If the machine still fails after the primer passage is corrected, convert the visit to a broader diagnosis rather than stacking parts.
Written and published by Ridgeline Small Engine.