I did some extinsive research before I bought my JR supercharger, and one common thing I found out about the whipple is that one of the belts kept coming off or would break completely. The now "newer" ones that are sold come with a different size belt from what I understand. I would definately call whipple industries and inquire about your belt problem. Seems like it is a common issue that was not fixed until the later supercharges were sold. Who knows, maybe they will even send you a free belt.
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