Your Kawasaki klx125 is a four stroke motor cycle. Do not use 2 stroke oil. Use any oil that is JASO MA certified motorcycle oil . In this case use 10w-40. A synthetic oil has some benefits . Your bike will run cooler and shift easier. Do not use car oil or any oil that says Energy Conserving on the label. These oils will shorten the life of your wet clutch and transmission gears ( different additives ).
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