Typically there is a plug in the top of the fork that can be accessed by removing a metal or rubber cover, but it really depends on the model motorcycle you are working on . . . the best resource is a clymers repair manual for most models. These can be purchased online (usually on ebay) for $10 - $20. If you plan on working on your own bike, these are a must have!
you apply oil to the suspension area and then push it up and down to work the oil in.
mom
From my under standing if your riding MOTO, with a fork oil level gauge you measure put 110 mm.
3 oz each fork. automatic transmission fluid is ok to use.
220cc in each leg
It takes 5.6 oz of fork oil in each fork.
qt fork oil and type oil for the front fork on each side
vl250 fork oil quantity
the front fork oil leval is to be set at 130mm from the top of the fork (air gap)..with the fork spring out ..and the fork fully collapsed ....
fork oil amount yamaha thunderace
400cc 5wt fork oil
r1 fork oil capacity