Are you sure you use the appropriate belt ?
what are the dimensions of it ?
alt pulley dimensions on a bosch 80 amps is 41 mm (1.6 inch) (the inside smaller groove where the teeth are)
the 60 amps of the 240 are smaller,im sure.
the belt must be 9.5 mm or 10 mm wide (0.39 inch)
it's the same for the 240 740 or 940 seen the crank pulley is the same.
i don't think the size of the pulley is faulty.
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