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Finally, the Opti-Spark unit is revealed. Only three bolts fasten it to the engine, but before removing them, pull the plug wires (mark them if it's not obvious where they go) and the electrical harness connector. The 10mm socket will remove the three bolts--the top two are easily seen at the top of the unit; the bottom bolt is on the right of the bottom. With the bolts out, carefully pull the unit off and disconnect the two vent hoses.