XR650L compression

I do not think this has been asked before. Is there a way to reliably increase the stock XR650L's compression to the 9.0-9.5:1 range (to bring it back near the XR600, which is I think 9.3:1) without changing the piston or rod? nd if so does anyone know of a shop near or in Ohio who can do it well?

I know you can get a thinner, (high compression), base gasket, but I don't know how much that actually increases compression. I would be curious if anyone knows, or knows the thicknesses of a standard and high compression base gasket.

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