This demonstration guide answers one field question about a bent impeller or a worn scraper bar left behind. Measurements come before parts, and the notes are not a generic equipment FAQ.
Diagnose before replacing parts
Start with impeller-to-housing gap and scraper height. That reading separates a bent impeller or a worn scraper bar left behind from adjacent faults that share the same complaint.
If the measurement is out of spec, treat the impeller and scraper bar as the primary path. If it is in spec, do not replace the impeller and scraper bar just to complete a parts list.
Repair the failed system
The usual correction is the impeller and scraper bar, 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 bent impeller or a worn scraper bar left behind.
Stop before you make it worse
Do not raising engine rpm to force a blocked chute. That shortcut hides the original measurement and creates a second failure.
If the machine still fails after the impeller and scraper bar is corrected, convert the visit to a broader diagnosis rather than stacking parts.
Written and published by Ridgeline Small Engine.