How? Got an overdrive sheave for the primary, and have no clue how to get the fixed sheave off to replace it.
(The water trick works great for pulling primaries by the way)
(The water trick works great for pulling primaries by the way)

You need a special tool. I made my own from steel I had laying around. Seen them made from wood even. You can make one, Buy one, or take it to your Dealer and they can take it apart for you.
http://www.totallyamaha.net/forums/showthread.php?t=56088
Last entry under "maintenance" has three links to grunt tool threads.
Last entry under "maintenance" has three links to grunt tool threads.