Piston clearance for XR 660??

Just got myself an XR 600 big bore kit from Thumper Racing. The sleeve is in the barrel and now I wonder what play to use for this rather short piston. Anyone with experience can tell me?

Is it a forged or cast piston...One would think that some clearance specs came with the piston...Most piston manufacture's supply the needed info for the application.... :thumbsup:

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