first 3 are engine type, fourth is year, 5th to 10th are sequence. what family is it - 2v, 2v ds, 3v, 4v desmo, 4v testa? the first section of the manual for a given model often has this info.
wacky that the s4r and st4s have different engine codes, when they're exactly the same engine. you have to wonder what the usa authorities had against the completely obvious ducati engine number series.
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