upside down fork oil question

[Rich1988]

Hiya my inner tubes on the front forks are corroded and its proving to be lots trouble to get it sorted! basically I now have a solution but its going to take a couple of extra weeks one fork has no leakage at all but the other has leaked a considerable amount (seals and oil were done less than 2 months ago)

my question is can I just top up the fork oil in my fork? the manual has a guide on how to change it which involves taking out the fork spring etc so you can measure the oil in there but can I just not take that lot out and just pour some extra fork oil in the top? the fork oil is less than 2 months old so wont be contaminated and its only for a couple of weeks I just want to know if there is any reason why I shouldnt?
Thanks!

 

[Rich1988]

I have been riding it leaky for a couple of weeks, and I was going to just put them back on but I compressed them both with my hands and the full shock springs back quickly and is hard to push down but the one thats leaked pushes down much more easily and takes far longer to spring back, which Is probably quite unsafe

 

[Rich1988]

its probably pitted, my bad, just little pick marks all over the stanchions, It would be one of the first things you should check I realise now!! its 2000 zx7r with less than 6000 miles on the clock its just been sat up for a long time hence the damage to the forks :'( I poured some oil in there and now they are rebounding at the same rate but the leaky one comes back up slower so I suspect the spring may not be very healthy

The oil isnt leaking on the discs or near them! if it was I wouldnt be riding it, I like brakes!