Is it normal for Honda pedal 125 magneto to rust?

normal. Honda pedal 125 magneto is made of steel, and iron in some parts is easily oxidized and corroded in humid (H2O) air (O2). Iron rust is a very complicated chemical reaction, with both chemical corrosion and electrochemical corrosion. So it is normal. Honda, the full name of Honda Technology Industry Co., Ltd., is a multinational motor vehicle manufacturer listed on both Tokyo Stock Exchange (TYO) and new york Stock Exchange (NYSE).