more than likely it is squeeling because the secondary is shimmed for a used belt. you need to put the washers back in to the three bolts behind the secondary. the other issue could be that the yamaha belts vary greatly in length between one another (i have seen up to 3/8" difference between belts), you might have purchased a "short" belt. If your center to center is on the tight side this will be more of an issue. i am not aware of any differences between the two belts, usually the "01" is a change in lot number or similar change in production. if yamaha makes a significant change to a particular part number, they will use a "-10"