Do you have a gasket on there? Is the vent snorkel clogged? I'm no expert, but it sounds to me like your belts are getting excessively hot, heat is the only thing that breaks kevlar from what I understand, and this can only be rectified by modifying your cvt case.
Have you thought of modifying and cutting your cvt case to let more air in there? something like this? 
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Bashan Peace Sports 50 Former "Secret 60" named
"The Great Leap Forward":
Performance CDI, Koso Variator, ignition Coil, UNI Filter, iridium sparkplug, etc.
16/50 Performance Gears
Six 9g Dr. Pulley variator slider weights
2k clutch springs
38 Pilot Jet
95 Main Jet
Pirelli SL-26 Tires
10w40 Castrol 4T
A9 Camshaft
Performance exhaust
81.2889cc, 50mm BBK
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