You need to keep the rear belt somewhat loose. Having that belt tight, will quickly destroy that center pulley and the teeth on your rear belt. I cannot remember the belt tension setting in the manual, but refer to that and loosen the belt by one notch or two on the plastic tensioners on each side of the diff.
I have a habit of nearly locking my slipper only due to I run my 511 (and previous 501s) on a high traction surface, but you want to allow the slipper to do it's job a little bit.
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Tamiya America - Trakpower - 92Zero Designs
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