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Engine skips at high
speed.
Gap between electrodes of spark
plug is too close.
Set gap between electrodes at 0.7 to 0.8mm
Engine overheats
Cooling air flow is restricted.
Remover any debris from slots in shroud,
blower housing, air passages
Incorrect spark plug.
Install F7RTC spark plug and cooling fins on
engine.
Mower vibrates
abnormally
Cutting assembly is loose.
Tighten blade
Cutting assembly is unbalanced
Balance blade.