How much oil do I put in each fork seal in my 1982 kawasaki 440 LTD?

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If you never have put for oil into a set of forks, yes you have to check both forks. I would suggest treading lightly. If you have time and a place to block the bike as well as a manual you can do it.
Are you adding oil because the seals are leaking or do you have excessive stiction in the fork? If the seals are leaking, you will have to pull the forks and add new seal and put in exactly the right amount oil.
Do you have air seat or is it a closed fork?
For you en500 you should have a volume of oil in your service manual.

This is something you do not want to get wrong. Your life is riding on it!!! Go to your Kawasaki Dealer and get exactly what they tell you to get. Nothing Less.

I have a 1982 CB750C the manual says the quantity is the same for all bike before 1982 it says 6 ounces for the air assist fork models. this is from a clymer manual i recently bought. Highly recommend getting one

is their oil leaking down if so you blew a fork seal if not yes springs are worn or damaged

What weight oil? 10w or 15w is good for fork oil. Also check that your valve that controls the oil passing back and forth is not obstructed inside the fork tube.

i would do the same as the other post has said, but i would use the old seal to drive the new seal in with a rubber mallet that way you cant damage the fork.

hi there ,, if u have taken the forks out ready ,,then u already have an idea wots wot ,, wen u put the new seals on ,, be sure to well oil the seals be putting on to the fork leg,, oil up the fork leg aswell ,, with any oil to hand,, or the seal will pinch or stick as u work your way down the fork tube ,, wot i do to seat the seal in to the bottom part of the leg is use a piece of drainage plastic pipe the same diameter,,,ie, like u see on sinks and washin machines,, the white pipe, use this to push the seal down,, to be able to put on the circlip to hold them in, ,,ive known people to use a hammer and screw driver, to push seal in to its seated postion and marked the fork leg,,and put pits in the leg,, so the seal pops straight away,, avoid the hammer,, cheers,,