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volumetric effiency, if all factors (case volume, transfer area, exhaust tunnel diameter, pipe, etc...) are tuned the same for bigger cc's as a basic rule of thumb we go by is 10hp for 100cc. not always the case but usually fairly close. jmo one of the biggest factors is ignition timing that holds back bigger bore longer stroke engines, sure its easy to acheive finish timing around 14-16 degrees btdc with any stock ignition but the curve up thru can almost always be improved for differnt engine combos. there are a few stand alone ignition systems out there that can be adapted to twin or triple cylinder two strokes (have installed many with excellent results). ignition / compression and pipe will make or break a big bore. again just my opinion
