I've already read the Two-Stroke Tuner's Handbook cover-to-cover. I especially enjoyed the part about port modification, wherein the author said "It would be nice if an engine's performance could be reduced below a certain minimum by even the worst butchery of the ports, but unfortunately that is not the case." I appreciated the snark.

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So...should I raise the sleeve by 0.1mm or 0.2mm? Is there likely to be a significant improvement from raising it 0.2mm vs. 0.1mm, or is 0.2mm likely to be too much?