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Message: <blockquote data-quote="flyerdan" data-source="post: 105130" data-attributes="member: 2510">I think that if you were producing enough torque to make a splined sprocket slip, it would be a one and done, more like a shear. It's possible that the bang could be something loading up and releasing, like if one of the tires is a different size. Like one new one, or a new set on one end. The different diameters, however slight, will create an imbalance in forces.You might check out the manual thread for tools and part numbers, don't recall seeing anything for the 642 but it might be there.</blockquote>