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As far as I can tell little engines like these don't have a crank pin like a bike engine. It's all one solid piece.
If you put a +2mm stroker crank increased displacement to 471cc and that would reduce at the same time reduce chamber volume 6cc and would give you a compression ratio of about 10:1.
If they tried to fill the hole by moving metal to the too of the piston you can only move about 6cc of metal, that's about like making a little over 10:1 compression the piston 1mm do in in the hole with a little 3cc hemi ridge.
That's assuming the stock engine is 9:1 compression with 51cc of total chamber volume, that's down in the hole plus head gasket plus chamber volume.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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