If this is a 2 stroke engine it does not require an oil change.
If this is a 4 stroke engine most motorcycle manufacturers recommend 10W40 oil and an engine that size should require approximately 3 QTS of oil. However, personally I have always used 20W50 in all of my 4 strke motorcycle engines. You also mentioned a problem what is the problem with the KX 125?
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is that all you want or would you like me to track down a service manual for you that includes those specs?
also, is it a kx65 or a kx125 ?
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