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Fuel
Please use leadless gasoline. If slight explosion sound comes from the engine, the possible cause might be improper using of general fuel.
thus places replace the fuel.
Note: Using leadless gasoline can prolong the lifetime of the spark plug.
Engine Oil
Use of high quality 4-stroke engine oil would extend the lifetime of the engine. Grade SE or SD engine oil in API method is recommended,
whose viscosity is SAElOW-40. If this oil is not available, please purchase appropriate substitute according to the data listed below.
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