Re: Puch maxi stock piston size is under 49mm?

Saabsonettguy . /
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I'd go with a B6HS, its one heat range hotter than B7HS. You can pick them up locally at your auto parts store. Give them the stock number, (7534) for B6HS, (5110) for B7HS.

I'm not sure your "short" piston is actually OEM puch, that rough machining looks more like what you would find on a modern aftermarket part.

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