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On the top is the old-style Hyvo chain and camshaft. As you can see, the chain consists of multiple plates and rides on a wide sprocket on the cam. Both ends of the cam are the same diameter. On the bottom is the new roller chain along with one Andrews conversion cam. On the case side of the cam (left in this photo), the diameter is 0.875 inches to fit into the existing cam bearing in the case, while the outer diameter of the cam that spins in the cam support plate is larger. View Related Article
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