Looks like your belt is shredding, you might want to remove the clutches and give them a complete inspection & service, as well as make sure they are aligned properly on the sled. Check your sheaves for cracks or other damage, and check you sliding bushing for wear, very common on the primary especially. Rollers & weights can wear as well, along with the 6 plastic sliders in the towers. Basically clean & check everything thoroughly especially if you think these have even 1/4 of the km's listed for the engine.