Hirth Brain
New
Dashboard
Piston seizure — exhaust side scuffing
Not Fixed
450cc
Updated 2026-06-20
Overview
Hypotheses
2
Notes
0
Collaborate
Possible Causes
None of these? →
#1
Lean condition from incorrect altitude jetting
79%
· partial
#2
Restricted fuel filter under sustained load
55%
Dashboard
Search
Knowledge
New