You could drain all the oil from your drive and fill it with the correct measured amount (150cc ?). Then see what the difference is between the center and side stand is.
Don't forget to post the results as I would like to know too, but I'm too lazy busy to find out.
Clymer listed the final drive capacity as 250 cc and the swing arm as 150cc. I used a great graduated beaker from Ted's Beemershop and it appears to the correct amount for both the final drive and swing arm.
Duane, I have a question for you: I just rebuilt the R90S transmission. Thanks to the video from Cycleworks, I carefully installed the new seal on the out-put flange and then also carefully ensured the crescent shape hole between the transmission case and the outside edge of the seal was clear. What is this gap? A vent for the transmission?
Thanks again to you, SteveD, et al for the responses!