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Check the centrifugal weights in the base of the distributor and ensure there are no damaged or missing parts (weights or springs). Then carefully line up the new Pertronix Ignitor III (PN 71281, $143.95) assembly with the attaching holes in the distributor. The small white dial on the face of the Ignitor III is how you can set, or even disable, the built in rev-limiting function. It's set at the factory to 5,500 rpm, which was fine for our mild cruiser of an engine.