While measuring what came out and putting the same amount back in works. Setting the oil by distance from the top with the forks bottomed out and no springs in them is the best way to do it.
You can put a little more oil than factory in them and stiffen the last part of the travel up so you dont bottom out.
I'd take the springs out, bottom the forks and measure how far down the stock oil is. When filling them back up go 1 inch closer to the top, remember to pump them up and down a bunch of times to get the air out before setting the oil height.
On my dual sports with similar forks (klr650 and dr650) we added at least that much extra and it makes the forks work alot better but guys knew the oil height and I just went by it. IE the factory was 165mm from the top and we went to 130mm.
I want to put 15 wt oil in my forks and raise the oil height/amount at some point, the forks are quite a bit softer than the shocks and this will stiffen them up without spending a bunch of money.
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