Also think slipper is to tight and/or belt too loose.
With old belts (501X) it was important to adjust belt tension after ~8 runs. Once it started to slip, the pulleys would wear out pretty fast.
On 511 Iīve never had that problem. I tighten belts as per manual. The reinforced belts donīt stretch out like the "old" 501 belts did.
So recheck belt tension. Notice that rear diff pulley/belt should be tightened 2 notches. 501X with 369 mm belt was only tightened 1 notch.
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