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Stock L20B bore is 85mm. You should easily be able to go 2mm (87mm) that's only 1mm (0.0394") of actual metal removed. Your thumb nail is about 0.030" so just imagine that much metal removed, hardly anything really.


The trouble is, is there is no stock 87mm piston that will fit the L20B without having a custom one made or swapping cranks and rods.


The stock L28 piston (86mm) will work and has a slightly smaller dish for slightly more compression

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