To change the oil on a 150f you have to take a cap off it takes a big socket set to do this. The cap is right next to the shifter. once the cap is off a spring is right behind it and and filter behind that keep those parts for later. the oil will begging to come out and you need a pan to catch it. When all the oil is out put the assembly back in and fill the bike with 10w - 30 oil. you need about 1.1 quarts.
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