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Can you ID a big 2T piston?

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My RM500 has a 92.5mm piston, the head has a 1.5mm spacer, the stock RM is, bore 88.5  x stroke,  80mm 

The piston is cast, no names.... what is it from? thanks!

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Now its cleaned up it has a logo on the crown,       HGM    The pin is 18mm diameter..... any one?

 

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