you probably need new shim bolts , they are in the back of the sec..if they have a washer under the heads ...remove and try it .. but being as old as it is ..you need new ones!
I agree with Yammy. My bolts did nothing even with no shims installed on my 96. Pull the secondary off and there are three small bolts that adjust the Sheaves by using shims. The v belt should stick a certain amount above the secondary. Not sure how much on yours but on vmax4 it is 5mm. Also make sure there is no oil or grease on the Sheaves.
the 97 is the exception to the belt height rule, unless you run the 8dn it should be level, or a tad below the sec.! if you try to shim the belt above the sec. it will squeal!