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None of the cylinders on a Metro are 180° out of phase. They're all 120° apart and counterweighted. If they were as you describe, the engine would always be out of balance and would never run well at all. That's why there's all this business about cutting and welding the crankshaft. You would have to do that (or have a new one forged if you wanted it to last more than a few seconds) to get an engine with any sort of balance at all.
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