G11- any engine swap options?

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Anyone knows of a larger capacity engine that was/is a straight swap into the G11 without major surgery to the metalwork?

Of course the CB-60 had more poke but that was basically a 1000cc with lower compression and a turbo charger.

I'd be glad to hear from anybody who has done a swap or bored out the N/A 1000 version and tried further mods.

I have the N/A 1000 with major overhaul necessary and am looking at possible conversions. With all the bother of an overhaul, just wondering if to open up the cylinders and see what is possible with it.

Cheers.