got'cha! Fork oil=YES Air pressure=NO With progressive springs installed.. i knew that there was "something" that could be eliminated once progressive springs were installed. Buti played it safe and came here with the question first...
Well, I have 1 leaking fork seal right now and that's why I don't run any air pressure. I ride a lot 2-up and am adding a sidecar so I'll have to replace that seal soon so I can add air to offset the effects of the sidecar.
I didn't feel any need to use air in the forks of the three models of 'Wing I've had Progressive springs in, 1100, 1200 and 1500. You can if you feel you need more firmness in the forks but unless you're a pretty big fellow I doubt you'll need it.
You have to have fork oil......and at the proper level. Not because of lubrication (that too) ......but because that's what dampens the spring. With no fork oil your front end would be like a pogo stick..........and it would bounce up and down going down the road. The fork oil is forced through openings in the dampening rod, and that's what slows the rebound and compression of your suspension. The suspension on the 1100's is pretty archaic.......modern forks have much more complex valving, even having the ability to adjust your compression and rebound dampening.
I just had progressive springs installed on my '99 SE; neither side of the forks was holding air. Rides like a new machine with no air and just the springs (and fork oil, of course). Should have done it before the Teton trip last month.