Fork oil amount for a ktm sx65 2008 - 2003 Suzuki VL 125 Intruder LC

I would expect it to be in the user manual, links attaghed:

KTM 65 MANUAL KTM PDF Manuals Judd Racing Youth Motocross Parts

KTM 65 SX 2015 Downloads

OWNERS MANUALS CATALOGUES

the SX forks really should be taken to a suspension tech to get the inner chamber properly bleed out.
You never just add a cc amount because there is usually some left inside. You bleed out the air and fill. once no more air is coming out you set the fluid level on the outter chamber 110mm to 120mm with the spring out and the fork collapsed.

Remove forks from bike, with each fork remove end cap and drain plug over a bucket drain oil from each fork reinstall drain plug on lower leg, replace oil thought top of the fork to spec, replace end caps and bleed oil from forks

https://youtu.be/kUzEuHYjodo

It's possible you may have leaked some oil, but first things first, clean the heck out of them and ride it around again to see if you are STILL leaking oil. If you have to top them up, there's a few methods out there, one guy I knew used a meter stick to measure the oil in the forks, but if you are going to be in there, you might as well drain the oil and start over with the correct amount of fluid. I hope this helps a little. Good luck.

Bruno

check the service manual

This is 1994 specific:

Oil = SS-8 10W
Amount = 15 ounces per fork leg (135mm down)
15 ounces or 460cc.

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.