my buddy has a Snap on tire machine with electronic balancer, I have had him do Hondas, BMW's and my Harley and I have had an occassion where no weight was needed. He balances to a .25 of an ounce. I have needed as much as 2 ounces as well. Just for kicks we always check the rim w/o tire to find the high/low spot and my Harley wheels as big and clunky as they are spot on for balance.

 

Maybe I should get this and do my own:
http://www.nomartirechanger.com/product/show/1
and this:
http://www.nomartirechanger.com/product/show/9
My wife is getting her own Harley so it may be worth it.
And maybe my freinds will use it.