Finally decided after all these years to change my fork oil.. with some assist from my favorite helper Chy (grandson) we managed to accomplish said task .. just one thing though. My manual says 487 cc of oil in each shock tube.. I only got 300cc or so from each side and no leaks evident so I went against my better judgement ( I always measure what i take out and replace with the same amount) and put 475cc's in each side.
The test ride was okay I guess but it seems I just don't have much suspension travel and the ride is pretty rough.

I'm wondering if my manual has some bad info since I got with the bike years ago.. anyone have a similar experience?

did you take the forks off and drain them? I always take them off and clean them out

Nope.. used my Fork tool and handheld vaccuum pump. Much simpler way to get it done.

Yeah it might be easier but that's probably why you have a fluid level discrepancy. I put in the exact amount specified when doing a fork off fluid change and have no problems

Chy, I see you tackled this after we talked about it at the rally.
Page 11.11 of the service manual calls for 548 cc or 18.5 ounces for the early model America and Speedmaster.

Here's my set up and my suspension is very good. No dive and no jarring or bounce.
I'm running progressive springs for several years. If I remember the Progressives call for a bit less fluid due to a larger top spacer.

I'm using a 50/50 mixture of 10w and 15w. 532cc or 18 ounces.

Loosen top cap, lift bike and remove the caps, springs, washer and spacers. Lower the bike,Drain fluid ( I use a pneumatic bleeder, sucks it all out)
Add fluid to the correct level.
Additionally I measure with a metal yard stick, the fluid level is 6.5 " from the top of the fork.

Raise the bike, install the springs and spacers. Install the caps. Works every time.
Hope this helps.

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Page 11.11 of the service manual calls for 548 cc or 18.5 ounces for the early model America and Speedmaster.

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What years are referred to as early?