When I built my 511 as manual sed, the belts were way too tight. If belts are too tight that will also kill the pulleys. One way to compare belt tension is to check how many times you can rotate the belt. On my 511 I can rotate the belt 1,5 rounds and that tension works on my car.
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Xray XB4 - Serpent S411 - Tamiya F104W - Yokomo BD7
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