Rato 60-7559-6 Manuel Du Propriétaire page 12

PRE-OPERATE INSPECTION
Fuel may damage the oil paint and plastic. Be careful not to spill fuel
when refueling. Any damage due to oil spilling is not within valid
warranty.
"Light knocking" or "spark exploding" sound can be hear when the
engine overloading. It is normal. Do not be worry about that.
If " knocking" or "spark exploding" sound occur at a steady speed
under normal load, change brand of gasoline; if such phenomena still
happen, consult your dealer for help, otherwise the engine may be
damaged.
When the engine is running, continuously "Knocking" or "spark
exploding" sound occurring will damage engine.
"Knocking" or "spark exploding" sound from misusing will not be
within the valid warranty.
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