"Warning" Don't Bench Bleed Me

That method does works on a single; BUT; you have to keep the air bubbles moving until they come out somewhere. If you stop pumping, the bubbles will stop moving, aaand if the angle is favorable, then they will turn around and backtrack to find a trap or backtrack all the way to the master, where they will be trapped in the high spot, at the front of the M/C...... and drive you crazy trying to solve a soft pedal.
So to overcome that, if I suspect it, I crack the fitting at the front and let the air out, lol. Sometimes I get a helper to push the pedal down enough to cause the brake shoes to go out at the back. then when you crack the fitting, the return springs will force the fluid back to the M/C and since the pedal is still partially down. the returning fluid has to force the air out for me. Course it will make a mess, so deal with it, lol. Then close the fitting and release the pedal.
It has happened to me that I just couldn't get it, so let it sit overnight. The extra time allowed the bubbles to accumulate at the top and the next morning I cracked the fitting and released the air, and BINGO.
As for me, I hate pumping bubbles downhill, so I bench-bleed everything. If the Front of the M/C is uphill from the firewall, I might "benchbleed" on the car; it's easier but does require a helper. Sometimes the fluid wants to just shuttle back and forth and the bubbles never come out. In this case you have to pinch the bleeder hose off on the return stroke, so that the returning piston draws properly thru the Compensating port.
Don't forget, brake fluid eats paint so if you make a mess, stop everything and clean and flush the area.It's not instant so don't panic.