The others are PARTLY correct. While the clutch is supposed to have SOME play to it, it does have a limit.
According to my service manual, the secondary sheave free play clearance is supposed to be 0.02-0.03". Thats not a lot of play.
You will need a feeler gauge to measure the clearance. If it is more or less than that, you will need to add or remove shims to get it set right.
To adjust that play, you remove the big bolt in the middle of the secondary that holds it on. You will see all kinds of shims/washers on the bolt that go between the secondary itself and the head of the bolt. If you add shims, the free play is decreased. If you remove shims, it is increased.
My '90 Phazer II had some play to the secondary, but it was just enough that you could just barely wiggle the secondary. I ran it 300 miles that winter, and rode the heck out of it using a cheap $20 Parts Unlimited belt. When I summerized the sled, the belt had no wear on it and there was no belt dust in the bellypan of the sled.
Hebi