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hey i got your e-mail and went to hit reply but i accidentally hit delete so ill tell you here. for the oil, start your 125 and let it idle for 3 mins (revving the motor every 3 seconds). doing this makes the oil flow more easily and gets it all out. there is a nut under the motor. It kind of sticks out and is in the middle of the motor so youll see it. Remove that nut, and all the oil will come out. (careful itll be hot) Make sure you have something to catch the oil becuase it will all come out suddenly after the nut is off. Once it is all drained, screw the nut back in and fill the motor with oil. to do this, there is a rubber cap on the right side of the motor next to the kickstarter. open that and theres where the new oil goes in. I used Maxima MTL endurance 85wt transmission lube and it worked great. I sold my 125 so i no longer remember how much oil you need, but you can tell by looking at the window; the level should be in the middle of the window.
For the radiator, use half water and half radiator fluid and pour it into the radiator until it raches the top. Im not sure what kind of radiator fluid to use, i never had to replace/refill mine. To check radiator fluid, take off the cap and if you see fluid, your good to go. If you dont see any, you must out some in so it fills to the top. REMEMBER NOT TO OPEN A RAIDATOR IF THE MOTOR IS HOT.
Other things to frequently check are air filters, spark plugs, tire pressure, spoke tightness, and making sure all nuts and blots are properly tightened.
I would highly recommend getting a owners manual for your KX. This will tell you everything you need to know, and getting one and learning about your bike will make it last a lot longer. Try to get to your local dealer ASAP and purchase an owners manual!
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