If you see the bubbles in the tube to the reservoir, chances are you also have some in the master cylinder and that is the reason the lever has no pressure. You should try opening the reservoir and working the clutch lever. Tap on the MC and the rubber tube. That might dislodge the air and it will float up to the reservoir and out into the air in your garage and your done. Worth a try. If it doesn't work after repeated attempts, do steps 44 through 54 here. You might want to read the whole tutorial but all bleeding is pretty much the same no matter what location the bleeder is.
Perfect time to practice. You can't literally screw it up any more than it is. If you let air in, there already is air in there. Just observe, bleeder CLOSED, PULL lever PUMP-PRESSURE in lever-PULL HOLD, OPEN bleed-fluid moves, CLOSE bleed, RELEASE lever PUMP-PRESSURE- HOLD, OPEN bleed....and just keep doing it until fluid flows along with your air bubbles. Just don't crank on those bleeders when you close them. IT's not necesary and just wears out the threads, Barely snug is fine.
Master cylinders with air are a bitch to get flowing. Be persistent. It will be difficult to know if you are doing the bleed correctly because it will not be real obvious when you get a tiny bit more pressure pumping. There's air in there. Keep at the pump hold open routine and it will eventually start to flow.
If when you get the MC clear of air the lever is still soft, continue with the tutorial and bleed the slave.
I would normally start with the slave and then do the MC but if you have no pressure in the MC, you can't do either.
Go back and bleed the MC one more time after the slave.
Don't tighten down those bleeders until you are done. finger tight is fine. Torque after finished. You will probably get seepage at the bleeders. Watch for this. Wash it off immediately. Give it a little crick more tighter on the bleeder. Just a touch. That should seal it. It will stop eventually. This is why I don't bleed unless I really need to and why I am so careful about not wearing the threads--the seepage. Sounds like you probably will need to bleed.
How did air get in the line?
My bike has had a soft clutch lever after sitting a long time. I pump a few times and it comes up. If not, I guess I would bleed as described above. No idea how air gets in there except maybe it has been in there all along and finally found its way up to the MC where it is really going to cause a loss of pressure. The clutch is meant to travel the full throw so it is harder to notice a soft clutch lever than it is a soft brake lever.
Possible you have a loose banjo bolt, leakage at the slave cylinder seal???? A loose bleeder??? I would not bother to check torque unless you see signs of fluid leakage or if the problem returns after bleeding. No sense in over-tightening banjos or bleeders if they are not definitely leaking.
This will probably be totally fine after you get the MC bled.
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