magnum head gasket & detuning

benji treat /
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I've been reading all these old moped repair books I recently acquired and I'm getting rather curious about how the magnums were detuned for the american market through the use of a aluminum head gasket. I've heard say that some puch engines don't even need a head gasket, but what's the truth of the matter? I've got three magnums I'm interested in getting in tip top, and I'd like to get rid of anything slowing them down.

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