blower housing are blocked.
Engine skips at
Gap between electrodes of
high speed.
spark plug is too close.
Engine
Cooling air flow is restricted.
overheats
Incorrect spark plug.
Mower vibrates
Cutting assembly is loose.
abnormally
Cutting assembly is
unbalanced
Set gap between electrodes: refer to ENGINE OWNERS
MANUAL
Remove any debris from slots in shroud, blower housing,
air passages
Install F6RTC spark plug and cooling fins on engine.
Tighten blade
Balance blade.
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