I've got a rear flat tire on my XB-600 I'm trying to change (tire and tube). Somehow I managed to get a four inch nail in it, and it chewed up both the tire and tube. I followed the instructions on another thread on how to change the rear tire, so I've got the tube and tire off the rim, the axle nuts and lock nuts out of the way, the rear brake cable disconnected, etc. Everything's out of the way but I can't slide the rear wheel backwards out of the fork because of the bike chain holding it. I thought I would be able to slide the rear wheel forward just enough to remove the bike chain from the sprocket teeth, which would then give me enough slack to pull the wheel back enough to disengage the left end of the axle so I could replace the tire and tube, but no such luck. The reason I can't slide the rear wheel forward is because of the washers with the lock tabs mounted on the inside of the rear fork.
I need to keep the bike chain functional because in Maine, the XB-600 is a moped and needs to have functional pedals, even if I choose not to use them. Otherwise, I'd grab a bolt cutter and take the darn thing off. Any ideas?