It should have a purple spring in it. The cam arms are listed as N-1, but are not stamped N-1. I would have to look it up. My belt life actually went up when I switched to a 102C (13 years ago or whatever it was). The 102C, at least on mine, grabs the belt and the machine moves. The stock clutch would slip a little off the line.
Are you burning up the belts or are they breaking? There is also the possibility of there being an issue with the driven. The driven resists letting the drive clutch upshift. The amount of resistance sets the belt tension. If the spring in the driven is not wound tight enough, belt tension would be low and the belt will slip.