Sorry about the double post, I am new to this kind of thing and posted two of the same problems. good lessen for me.
I am thinking my secondary is from another arctic cat all together. The guy a bought the sled from has allot of snowmobiles on his farm yard and all kinds of makes and years. When i got the sled from him the secondary was just lying on the belly pan where the secondary goes on. When I looked at the sled it was not even there, I asked about it and he said he had it and would supply it if i decided to buy it from him.
The belt is a after market belt. I could go and get one from the arctic cat. but I was told that it would be just as good as there marked($)up ones, They wanted $85.00 for one with there name stamped on it. The one i have is well in the specks my repair manual says it should be.
The problem is when i put the belt on, it is to tight, it has no deflection what so ever. If i open the secondary and let the belt go into it a bit, there is deflection. So when you said to put shims, it made sense. But when there are already three shims in it, is there a limit to how many I can put in? My book only shows two shims, just like the diagram you supplied to me.