MMMmmm, Not a easy one....the thread count on the bolt is not a good way to gauge belt tension imo. I reach down and test belt deflection from the tensionor pulley to the crank pulley(under the motor mount). If it more than a 1/4 inch, time to tighten the belt. After you get the tension right, remember to get at least 50ft lbs on the 17mm pulley bolt.....or it will come off.
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