It is possible to change the fork oil without removing the forks.
Just takes a little planning......
For now; I'll assume you know how to remove the caps/springs etc.
{If not, I can post a video or we can do some basic instruction}...
Basic/quick Fork Oil Change
After the caps are removed, {with bike on center stand} remove the springs and let the front settle as low as possible.
NOTE: Put a rope or other on the center stand to assure it does not fold us when the fron end settles.
Use a suction tool to remove all fluid possible. Fluid measurement NOT necessary. All the oil will not come out...
Put some clean fluid into the forks and exercise them up and down to flush the oil.
Repeat this operation until you feel the oil is clean. {perfection NOT needed}
With the caps and springs removed, {with bike on center stand} let the front settle as low as possible.
Pour fork oil into each fork until it is approx. 6" from the top.
Exercise the forks up and down to flush the air out of the oil.
Put your suction tool into each fork leg to a depth of 6 1/2".
Suck the oil out until you draw air.
When you draw air, your fork level is 6 1/2"...
Raise the front to full extension, and put a jack under the engine.
Reassemble spring, spacer, cap, etc...
Ride it...........
NOTE: The perfectionists will kill me, but I'll add this.
ATF makes excellent Fork Oil.. [hint, hint]
ie; Fork Oil and ATF are both anti foaming hydraulic fluid and the ATF is approx. 10 wt..
Ride safe, Ted