How to change oil on a 1999 KTM 250sx?

I was taking the cylinder off and forgot too drain the radiator fluid so now I have radiator fluid in the bottom end how do i get that out and how do I change the oil how much new oil is required and what kind/??How to change oil on a 1999 KTM 250sx?There is a drain plug on the bottom of the case. It is gear oil. If you go to the local bike shop they will have a selection of different brands. I have always used silkolene. If I remember correctly it will take about 1 quart or a little over. There is a fill window on the side of the case. This oil should be changed rather often. I used to change mine after 2 to 3 times out riding.

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