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KTM recommends .7 Liters Motorex Top Speed 4T15W50 for the 125SX. Let us know if we can be of further service.
You will want to remove the cover then use a light plastic hammer and a small punch to remove the seal. It should come out very easy. Install the new seal evenly.
If you get the sevice manual or contact a dealer to get the correct oil amount for your bike, they need to know the model and year, you have to have the forks off the bike. take the fork caps off, take the springs out compress the upper fork tube all the way and add the specified oil. if they also give you the measured amount from the top that's the best way to get both fork oil levels exact. there is a special tool that you set the oil level in millimeters and it sucks out the oil to the right level, but before you do that step after adding the oil always pull and push on the cartage rod several times to remove air from the cartage tube. you will hear the air coming out and you will feel the changes in the cartage rod as the cartage tube fills up with oil and the air is removed.
something i'm confussed on though is if you replaced a seal you would have had to brake down the fork to replace it. you would have poored the oil into a container, cleaned all the internal parts,and used a fork seal driver to install the new seal. part of your question asks where do i put the oil in? thats in the open end of the fork after you have taken off the fork cap. It sounds to me like you only replaced the dust seal on one fork. that is not going to fix your leaking fork. you need to replace the oil seal thats pressed inside of the top fork tube.
but I was curious if I need some sort of rubber seal or a sealing compound for it. Thanks a lot!No you dont absolutly need it but it would be smart to have because I had the same thing happen on my yz125 and the carbon went everywhere and staind my swingarm. I just used a piece of old radiator tube because it was cheap and I didn't have to order it.,
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